CONDITION

Dental Disease in Dogs

A progressive condition affecting the teeth and gums that influences eating comfort, systemic health, and overall quality of life.

Why this matters now

Dental disease is among the most commonly diagnosed conditions in dogs, with studies indicating that the majority of dogs over three years of age show some evidence of periodontal pathology. The prevalence increases with age and tends to be more severe in smaller and toy breeds, where the proportionally larger teeth relative to jaw size, crowded dentition, and retained deciduous teeth create conditions that favour plaque accumulation and periodontal pocket formation. Brachycephalic breeds also show elevated prevalence due to their altered jaw conformation and tooth alignment. Unlike tooth resorption, which is predominantly a feline condition, canine dental disease is overwhelmingly dominated by periodontal disease — the progressive inflammatory destruction of the supporting structures of the teeth driven by bacterial biofilm accumulation. Fractured teeth, particularly the carnassial teeth (upper fourth premolars) and canine teeth, represent another common category of canine dental pathology that may result from chewing on hard objects such as antlers, bones, or hard nylon toys.

Periodontal disease in dogs follows a well-characterised progression from gingivitis (reversible inflammation of the gingival margin) through early periodontitis (beginning of attachment loss and bone resorption) to advanced periodontitis (significant bone loss, tooth mobility, and potential tooth loss). The rate of progression varies considerably between individual dogs and even between different teeth in the same mouth, influenced by local factors (tooth position, crowding, malocclusion), systemic factors (immune status, concurrent disease), and environmental factors (diet, chewing habits, home care). In small and toy breeds, the progression can be rapid, with significant bone loss developing within a few years if the disease is not managed. The cumulative nature of periodontal destruction means that bone loss, once established, is largely irreversible — while the inflammatory process can be controlled, the supporting structures that have been lost generally do not regenerate. Advanced periodontal disease can lead to oral-nasal fistula formation (communication between the oral and nasal cavities), pathological jaw fractures (particularly in small breeds with severe mandibular bone loss), and chronic pain that may significantly affect quality of life.

Signals & patterns

Early signals

Halitosis (bad breath)

An increasingly noticeable or unpleasant odour from the mouth is often the first sign that owners become aware of, arising from volatile sulphur compounds and other metabolic byproducts of anaerobic bacteria proliferating within dental plaque and developing periodontal pockets. The odour tends to worsen as the bacterial load increases and as the disease progresses from gingivitis to periodontitis. While some degree of oral odour may be present in healthy dogs, a marked or worsening halitosis often reflects an expanding subgingival bacterial population and associated tissue inflammation.

Visible calculus and gingival redness

Yellow-brown deposits of calculus (mineralised plaque) on tooth surfaces, particularly on the outer surfaces of the upper premolars, molars, and canine teeth, may be visible during routine observation when the dog yawns, pants, or allows lip retraction. The adjacent gingiva may appear reddened, swollen, or may bleed slightly when touched or during chewing. These visible changes represent the surface manifestation of a process that typically extends below the gum line, and the severity of visible calculus does not always correlate directly with the severity of underlying periodontal disease.

Subtle eating changes

Early dental disease may manifest as slight modifications in eating behaviour rather than obvious difficulty. Dogs may eat more slowly, show a preference for one side of the mouth, drop kibble during chewing, or shift from crunching dry food to swallowing pieces whole. Some dogs may show slightly less enthusiasm at mealtimes or take longer to finish meals. These changes can be gradual enough to escape notice or may be attributed to ageing, fussiness, or changes in food preference rather than oral discomfort.

Increased salivation

Some dogs with developing periodontal disease may produce more saliva than usual, which may be noticed as increased drooling, dampness around the mouth, or wet spots on bedding. Blood-tinged saliva, though more commonly a later sign, may occasionally appear even in earlier stages if the inflamed gingival tissue bleeds during chewing or play. The salivation reflects the oral irritation and inflammation associated with bacterial plaque accumulation and gingivitis.

Reluctance to chew toys or treats

Dogs that previously enjoyed chewing on toys, dental chews, or hard treats may begin to show reduced interest or may drop chew items more frequently. This change may be subtle — the dog may still pick up the chew item but spend less time working on it, or may favour chewing on one side. This reluctance can reflect developing discomfort from gingivitis, loose teeth, or early periodontal pocket formation around certain teeth.

Later signals

Loose or missing teeth

As periodontal disease progresses and alveolar bone support is lost, affected teeth may become visibly mobile or may fall out spontaneously. Owners may discover a shed tooth in the dog's bedding, food bowl, or on the floor, or may notice gaps where teeth previously existed. The loss of teeth reflects advanced periodontal destruction where insufficient bone remains to anchor the tooth, and typically indicates that other teeth in the mouth may also be significantly affected even if they appear externally normal.

Facial swelling or draining tracts

Periapical abscesses (infections at the tip of the tooth root) may cause visible facial swelling, typically below the eye for upper premolar/molar teeth or along the lower jaw for mandibular teeth. In some cases, the abscess may drain through the skin, creating a visible wound or fistula that discharges pus intermittently. The upper fourth premolar (carnassial tooth) is a common site for periapical abscess formation, and the resulting swelling below the eye can be dramatic and may be mistaken for other conditions.

Nasal discharge or sneezing

Advanced periodontal disease affecting the upper teeth, particularly the canine teeth and premolars, can result in erosion of the thin bone separating the oral cavity from the nasal passages, creating an oronasal fistula. This communication allows food, water, and bacteria from the mouth to enter the nasal cavity, producing chronic nasal discharge (often unilateral), sneezing — sometimes with food particles visible in the nasal discharge — and recurrent nasal infections. Oronasal fistulae are most commonly associated with loss of the maxillary canine teeth in dogs with advanced periodontal disease.

Behavioural changes related to oral pain

Dogs with significant dental pain may show more obvious behavioural changes including head shaking, pawing at the face, reluctance to be touched around the mouth, yelping when eating or chewing, and resistance to having the mouth examined. Some dogs may become less playful, more withdrawn, or show changes in temperament that can be difficult to connect to an oral source without direct examination. Chronic dental pain can also contribute to reduced appetite and gradual weight loss, as well as disrupted sleep patterns.

Click to read about the biological mechanisms

How this is usually investigated

Assessment of dental disease in dogs involves both conscious oral examination and a comprehensive dental assessment under general anaesthesia. The conscious examination provides a preliminary overview, but the full extent of periodontal disease, endodontic pathology, and other dental conditions can only be accurately assessed with anaesthetised examination, dental probing, and intraoral radiography.

Conscious oral examination

Purpose: An initial oral assessment performed while the dog is awake provides a preliminary overview of dental health, allowing identification of visible calculus, gingivitis, obvious tooth fractures, missing teeth, oral masses, and general gum condition. This examination guides the recommendation for a more comprehensive assessment and helps estimate the likely scope of treatment needed. The examination can be performed during a routine health check and requires only basic equipment.
Considerations: The conscious oral examination has significant limitations — the dog's tolerance limits how thoroughly the mouth can be assessed, subgingival pathology cannot be evaluated, the lingual (inner) surfaces of teeth are often inaccessible, and the caudal oral cavity may be difficult to visualise. The findings may substantially underestimate the true extent of dental disease, particularly periodontal pocket depth, root pathology, and early periapical changes. It serves as a screening rather than a diagnostic assessment.

Comprehensive dental examination under anaesthesia

Purpose: A thorough tooth-by-tooth examination performed under general anaesthesia allows complete visualisation of all tooth surfaces, systematic periodontal probing of every tooth to measure pocket depths, assessment of gingival recession, evaluation of furcation involvement in multi-rooted teeth, and testing of tooth mobility. Findings are recorded on a detailed dental chart that maps the condition of each tooth and its periodontal status. This examination reveals the full extent of dental pathology and forms the basis for treatment planning.
Considerations: General anaesthesia is required, which involves pre-anaesthetic assessment and monitoring. The comprehensive examination adds time to the anaesthetic period but provides information that fundamentally alters the treatment plan in many cases — studies have shown that the findings from anaesthetised examination frequently differ significantly from conscious examination estimates. The dental chart created during this examination becomes a permanent record that enables monitoring of disease progression at subsequent assessments.

Full-mouth dental radiography

Purpose: Intraoral dental radiographs provide essential information about the structures not visible on clinical examination: tooth root integrity, periapical pathology, alveolar bone levels, jaw bone density, retained root fragments, and endodontic disease. Full-mouth radiographic series in dogs typically require 8-12 images depending on the dog's size. Studies have demonstrated that dental radiography identifies clinically important pathology in a substantial proportion of teeth that appear normal on visual and tactile examination alone, fundamentally altering treatment decisions.
Considerations: Dental radiography requires specialised intraoral sensors or film, appropriate positioning techniques, and experience in interpretation. The procedure is performed under the same general anaesthetic as the dental examination and treatment. Not all veterinary practices have dental radiographic capability, and the additional time under anaesthesia for full-mouth imaging is generally modest. The diagnostic yield of dental radiography — the proportion of cases where it identifies pathology that changes the treatment plan — consistently supports its use as a standard component of dental assessment.

Pre-anaesthetic assessment

Purpose: Blood testing (haematology and biochemistry), and sometimes additional diagnostics depending on the dog's age and health status, are performed before the dental procedure to evaluate organ function and identify any conditions that could affect anaesthetic safety. This assessment typically includes evaluation of kidney and liver function, blood cell counts, and sometimes clotting parameters, cardiac assessment, or other investigations based on the individual patient's risk profile. The results guide the choice of anaesthetic protocol and identify any conditions requiring attention before or during the procedure.
Considerations: Pre-anaesthetic testing is a standard component of dental care planning and helps mitigate anaesthetic risk without eliminating it entirely. In older dogs or those with known health conditions, additional pre-anaesthetic workup may be warranted. The results occasionally reveal previously undetected systemic conditions that require attention in their own right, separate from the dental disease. Some dogs with significant concurrent health conditions may require stabilisation or modified anaesthetic approaches before dental treatment can proceed safely.

Options & trade-offs

Management of dental disease in dogs encompasses preventive strategies, professional treatment, and ongoing maintenance, with the approach determined by the type and severity of pathology, the dog's overall health, and individual factors. The goal of periodontal treatment is to control the bacterial challenge, halt disease progression where possible, and eliminate sources of pain and infection.

Professional dental cleaning and periodontal treatment

Professional dental treatment under general anaesthesia encompasses ultrasonic and hand scaling to remove supragingival and subgingival calculus, root planing to smooth root surfaces within periodontal pockets (removing embedded bacterial biofilm and calculus from the root surface), and polishing to smooth enamel surfaces. For teeth with moderate periodontal pockets, closed root planing (without reflecting a gingival flap) may be sufficient, while deeper pockets may benefit from open root planing (with surgical flap access for direct visualisation of the root surface). The treatment aims to establish a clean root surface that the periodontal tissues can reattach to, halting disease progression.

Trade-offs: Professional dental treatment requires general anaesthesia and may involve significant time under anaesthesia depending on the extent of disease. The treatment addresses existing pathology but does not prevent future plaque accumulation, so the interval between professional dental treatments varies depending on the individual dog's rate of plaque formation and the effectiveness of home care. The cost encompasses anaesthesia, the dental procedure, radiography, and any additional treatments needed. Teeth with advanced periodontal disease may require extraction rather than periodontal treatment if insufficient supporting structure remains.

Tooth extraction

Extraction is indicated for teeth with periodontal disease too advanced for conservative treatment (severe bone loss, excessive mobility), fractured teeth with pulp exposure, periapical abscesses, and other non-salvageable dental pathology. Surgical extraction involves reflecting a gingival flap to expose the alveolar bone, carefully elevating the tooth from its socket (with sectioning of multi-rooted teeth into individual roots for separate removal), and closing the extraction site with sutures. The procedure removes the source of infection, eliminates pain from damaged teeth, and prevents further complications from advanced dental pathology.

Trade-offs: Extraction is a surgical procedure requiring adequate anaesthetic time and surgical skill. Post-operative discomfort is generally manageable and typically resolves within several days, with most dogs eating comfortably within 24-48 hours of extraction. Multiple extractions may be required in a single session, and dogs with extensive disease may require extraction of numerous teeth, though dogs generally adapt well to eating with reduced dentition. Complications, while uncommon, can include root fragment retention, oronasal fistula formation when extracting upper canine teeth with advanced bone loss, and jaw fracture in small breeds with severely weakened mandibles.

Home dental care programme

Daily tooth brushing with a veterinary-specific toothpaste represents the most effective form of home dental care, mechanically disrupting the bacterial biofilm before it can mature and mineralise. The ideal technique involves using a soft-bristled brush angled at 45 degrees to the gum line, focusing on the outer (buccal) surfaces of the teeth where plaque accumulates most readily. Adjunctive home care options include dental diets with specific kibble characteristics that promote mechanical plaque reduction, dental chews carrying VOHC acceptance, water additives, and oral rinses. The home care programme is most effective when started early (in puppies or after professional cleaning) and maintained consistently.

Trade-offs: The success of home dental care depends heavily on the dog's tolerance and the owner's commitment to daily brushing. Many dogs can be gradually acclimatised to tooth brushing, particularly if introduced during puppyhood, though some individuals remain resistant. Home dental care slows but does not eliminate plaque accumulation, so professional dental assessments remain necessary. The evidence base varies for different dental products, and not all products marketed for dental health have demonstrated clinical efficacy. Dental chews and treats, while beneficial, carry caloric content that should be factored into the dog's daily intake.

Advanced periodontal procedures

In selected cases, advanced periodontal surgical techniques may be employed to manage specific lesions or attempt to regenerate lost periodontal support. These may include guided tissue regeneration (using barrier membranes to direct new tissue growth), bone grafting to fill osseous defects, and periodontal flap surgery for access to deep pockets. Endodontic (root canal) treatment may be an alternative to extraction for strategically important teeth (particularly canine teeth) with endodontic disease, preserving the tooth while addressing the infection within the root canal system.

Trade-offs: Advanced periodontal and endodontic procedures require specialised training, equipment, and expertise, typically available through veterinary dental specialists. The procedures are technically demanding, add time and cost to the dental treatment, and are only appropriate for specific clinical situations rather than as routine treatments. The long-term success of these procedures depends on the specific pathology being addressed, the quality of follow-up care, and the individual patient's response. Root canal treated teeth require ongoing radiographic monitoring to verify the continued health of the periapical tissues.

Common misconceptions

Misconception:

"Hard bones, antlers, and hard chew toys clean teeth and prevent dental disease."

Reality:

While chewing can provide some degree of mechanical plaque removal, excessively hard objects — including animal bones, antlers, hard nylon toys, and similar items — are a common cause of tooth fractures in dogs. The upper fourth premolars (carnassial teeth) and canine teeth are particularly susceptible to slab fractures from chewing on objects harder than the teeth themselves. A useful guideline is that if the chew item cannot be indented with a thumbnail, it may be too hard for safe chewing. Fractured teeth with pulp exposure become a source of infection and pain, creating dental pathology rather than preventing it. Dental chews specifically designed to be firm enough to provide mechanical cleaning but soft enough to yield under pressure represent a safer alternative.

Misconception:

"Non-anaesthetic dental cleaning is equivalent to professional dental treatment."

Reality:

Non-anaesthetic dental procedures (sometimes marketed as 'anaesthesia-free dentistry') involve scaling visible calculus from the crown surfaces of the teeth while the dog is awake. These procedures can improve the cosmetic appearance of the teeth by removing visible calculus, but they cannot address the subgingival plaque and calculus that are the primary drivers of periodontal disease progression. Without anaesthesia, thorough subgingival scaling, periodontal probing, dental radiography, and treatment of pathology beneath the gum line are not possible. The cleaned visible surfaces may create a misleading impression of dental health while significant subgingival disease continues to progress unchecked. Professional veterinary dental organisations have consistently stated that non-anaesthetic dental procedures do not constitute adequate dental treatment.

Misconception:

"Dental disease only affects the mouth and is not connected to the rest of the body."

Reality:

Chronic periodontal disease maintains a persistent bacterial population in direct contact with the bloodstream through the ulcerated epithelial lining of deep periodontal pockets. This chronic bacteraemia exposes distant organs to circulating bacteria, and histopathological studies have demonstrated bacterial colonisation and associated inflammatory changes in the heart, kidneys, and liver of dogs with severe periodontal disease. While the direct causal relationships between periodontal disease and specific organ pathology continue to be researched, the association between chronic oral infection and systemic health effects is well-documented. The inflammatory mediators produced locally in periodontal tissues also enter the systemic circulation, contributing to a chronic inflammatory burden that may influence overall health.

Dental disease in dogs is one of the most common yet often underappreciated health conditions, developing gradually and frequently remaining undetected until significant pathology has established itself. Understanding that periodontal disease is a progressive, cumulative process — where the supporting bone and tissue lost to inflammation cannot regenerate — provides context for the importance of both early recognition and ongoing management. The interplay between bacterial challenge, immune response, individual anatomy, and home care creates a unique dental health landscape for each dog, and the patterns of disease progression may differ substantially between breeds, sizes, and individuals.

Last reviewed: 24 April 2026 · Dr Alastair Greenway MRCVS