Periodontal Disease in Horses: Risk Factors, Symptoms & Management

Periodontal disease in horses is a common dental condition involving inflammation and infection of the tissues that support the teeth, including the gums, ligament, and surrounding bone. It often develops gradually and may go unnoticed in the early stages, allowing damage to progress before clear signs appear.

In horses, efficient chewing is essential for breaking down forage and supporting digestion. When periodontal disease develops, pain and structural changes in the mouth can reduce chewing efficiency, increasing the risk of feed impaction, weight loss, and digestive disturbances.

Unlike some other species, where plaque buildup is the primary cause, periodontal disease in horses is most often driven by feed trapped between teeth. Dental abnormalities, age-related changes, and forage characteristics can all contribute to this process, making both dental care and diet important factors in disease development.

Periodontal Disease in Horses

Periodontal disease is a common and often underrecognized dental condition in horses, involving inflammation and infection of the tissues that support the teeth. ^[1]

In horses, effective chewing is critical for breaking down forage and supporting proper digestion. When periodontal disease develops, pain and structural damage in the mouth can reduce chewing efficiency, allowing larger feed particles to enter the digestive tract. Over time, this can contribute to feed waste, weight loss, and an increased risk of digestive upset. ^[2]

The condition is most frequently observed in adult and senior horses, particularly those with dental abnormalities or age-related changes that promote feed accumulation between teeth. Because early signs are easy to overlook, periodontal disease may progress before it is identified. ^[3][4]

Diet, forage quality, and dental care practices all play a central role in disease development, making early detection and nutritional management key to supporting long-term oral health.

Table 1. Periodontal Disease in Horses at-a-glance

Pathophysiology

Periodontal disease refers to inflammation and infection of the structures that support the teeth, including: ^[5]

• The gums (gingiva)
• Periodontal ligament
• Alveolar bone

In the early stages, inflammation is typically limited to the gums (gingivitis). If left unmanaged, the condition can progress to periodontitis, where deeper tissues are affected and the attachment between the tooth and surrounding structures begins to break down. ^[1]

In horses, this process is most often triggered by feed trapped between teeth. As this material accumulates, it creates local irritation and allows bacteria to grow, leading to inflammation of the surrounding tissues. ^[3]

This mechanism differs from periodontal disease in some other species, where plaque buildup on the tooth surface is the primary cause. In horses, the physical trapping of feed between teeth is usually the initiating factor. ^[6]

Horses are particularly susceptible to this process due to the structure of their teeth. Their continuously erupting (hypsodont) teeth and natural wear patterns can lead to formation of small gaps between teeth, especially with age or dental abnormalities, increasing the risk of feed retention and disease progression. ^[4][7]

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Symptoms of Equine Periodontal Disease

Clinical signs of periodontal disease in horses are often subtle in the early stages and may progress gradually as tissue damage worsens.

Signs may include: ^{[3][4][5][8][9][10]}

• Quidding (dropping partially chewed forage)
• Slow or inefficient eating
• Preference for softer feeds
• Feed packing between teeth
• Weight loss or difficulty maintaining body condition despite adequate intake
• Bad breath (halitosis)
• Excessive salivation
• Head tossing
• Resistance to the bit

Advanced or secondary complications may include: ^[3][4][5]

• Unilateral nasal discharge
• Facial swelling or sensitivity along the jaw
• Pain while chewing
• Reduced performance or changes in attitude
• Tooth loss

Because these signs can overlap with other dental conditions, a thorough oral examination by a veterinarian is required for diagnosis.

When to Call the Veterinarian

A veterinarian should be consulted if a horse shows signs of difficulty chewing, weight loss, or changes in eating behavior.

Additional signs that warrant evaluation include: ^[5]

• Persistent quidding
• Foul odor from the mouth
• Nasal discharge
• Facial swelling or sensitivity
• Signs of pain while eating

Causes of Periodontal Disease in Horses

Periodontal disease in horses typically develops when feed becomes trapped between teeth, allowing bacteria to accumulate and irritate the surrounding tissues.

Contributing factors include: ^{[2][5][10][11][12][13][14]}

• Feed impaction: Long-stem forage and poorly chewed feed can get lodged between teeth, particularly in areas where gaps are present
• Gaps between teeth (diastemata): Abnormally widened spaces between teeth increase the risk of feed becoming trapped and retained
• Dental abnormalities: Conditions such as sharp enamel points, wave mouth, or step mouth can disrupt normal chewing and promote feed trapping
• Age-related changes: Older horses are more likely to develop spaces between teeth as dental structures shift over time
• Dietary factors: Coarse or stemmy forage and inconsistent chewing can increase the risk of feed accumulation
• Infrequent dental care: Lack of routine dental exams and floating allows abnormalities to persist and worsen

These factors often interact, with reduced chewing efficiency increasing the likelihood of feed impaction, which in turn promotes bacterial growth and inflammation.

It’s important to note that not all gaps between teeth cause clinical problems. Some allow feed to move freely and may only require monitoring, while others trap and retain feed, increasing the risk of inflammation and tissue damage. ^[13]

How Diet Contributes to Periodontal Disease

Diet plays an important role in the development and progression of periodontal disease by influencing how effectively horses chew and process forage. ^[15]

When forage is not adequately broken down during chewing, larger feed particles are produced. These particles are more likely to become trapped between teeth, particularly in horses with dental abnormalities or age-related gaps. Once retained, this material creates conditions that allow bacteria to take hold. ^[5]

Forage quality also affects dental health. Coarse or stemmy hay requires more effort to chew and may increase the risk of incomplete mastication, while softer forage is generally easier to chew and less likely to accumulate between teeth. ^[14]

Maintaining consistent fiber intake supports normal chewing behavior and saliva production, both of which help protect the oral environment.

Diagnosis of Periodontal Disease in Horses

Diagnosis of periodontal disease is based on a detailed oral examination performed by a veterinarian, as many changes occur below the gumline or between teeth.

During the exam, the veterinarian assesses the health of the tissues supporting the tooth, including the gums and underlying bone. Signs of disease may include: ^[1][5][11]

• Red gums: Indicates inflammation or irritation, commonly seen in early gum disease (gingivitis)
• Gum recession: The gradual pulling back of the gum tissue from the teeth, exposing more of the tooth or its root, which can lead to sensitivity and increased risk of decay
• Periodontal pockets: Spaces that form between the teeth and gums when the gum tissue pulls away due to advanced gum disease, allowing bacteria to accumulate

Additional evaluation may involve checking tooth stability and identifying areas where feed material is trapped. In some cases, dental radiographs (x-rays) are used to assess the extent of damage to deeper structures, including the bone surrounding the tooth.

Because early-stage disease may not produce obvious clinical signs, routine dental examinations are important for identifying changes before they progress.

Treatment of Periodontal Disease in Horses

Management of periodontal disease in horses focuses on removing trapped feed material, reducing bacterial growth, and correcting the underlying factors that allow feed to accumulate between teeth.

Because periodontal disease is often chronic, regular dental care is important to help prevent recurrence and maintain oral health over time. ^[1][5]

Cleaning and Removal of Trapped Feed

The first step of treatment is clearing impacted feed from between teeth and flushing the affected areas to reduce bacterial contamination. This helps limit ongoing irritation and supports healing. ^[1][5]

In some cases, deeper cleaning may be required to remove debris and damaged tissue from periodontal pockets, helping reduce infection and protect surrounding structures. ^[1][5]

Corrective Dental Care

Corrective dental work is often needed to improve chewing efficiency and reduce areas where feed can become trapped. This may involve addressing uneven wear patterns or gaps between teeth (diastemata). ^[1][5]

When structural gaps are present, ongoing management is usually required, as these areas can continue to trap feed even after treatment. ^[1][5]

Tooth Extraction

In more severe cases where the supporting structures of the tooth are significantly compromised, removal of the affected tooth may be necessary.

This is typically considered when other treatments are unlikely to restore function. ^[1][5]

Nutritional Management

Nutritional management supports horses with periodontal disease by reducing chewing difficulty, maintaining fiber intake, and limiting the accumulation of feed between teeth.

Forage selection is a key consideration. Horses with reduced chewing efficiency often benefit from softer, more digestible forage that requires less effort to break down.

In contrast, coarse or stemmy hay may increase chewing strain and the risk of incomplete mastication, making feed more likely to become trapped between teeth. ^[16]

In some cases, forage can be modified or replaced to improve intake and reduce mechanical stress during chewing. Soaked hay, hay cubes, hay pellets, beet pulp, chopped forage, or complete senior feeds can provide fiber in a form that is easier to chew and digest, particularly for horses with advanced dental changes. ^[14][17]

For horses with severe dental disease or few remaining teeth, these feeds are often soaked into a soft mash or slurry. This allows the horse to consume enough fiber and calories without relying on normal chewing.

An equine nutritionist can help design a balanced diet for horses with missing teeth, poor chewing ability, or no functional teeth. These diets need to provide adequate fiber, protein, vitamins, minerals, and calories while using feed forms the horse can safely and comfortably consume.

Feeding management can also influence outcomes. Offering smaller, more frequent meals may help reduce the amount of feed retained in the mouth at one time, while maintaining consistent fiber intake supports digestive function and saliva production.

Horses experiencing oral discomfort may show reduced appetite or selective feeding behavior. In these cases, supporting palatability can help maintain intake.

Strategies to improve palatability of the diet include:

• Introduce new feeds gradually
• Use masking strategies such as unsweetened applesauce, sugar-free peppermint syrup, cinnamon, or fenugreek

When combined with appropriate dental care, these strategies help maintain body condition and reduce factors that contribute to ongoing periodontal irritation.

Prognosis

Treatment of periodontal disease can result in reduced pocket size and reattachment of the gingiva to the teeth. ^[11] However, periodontal disease typically requires ongoing management for the remainder of the horse’s life.

This involves frequent dental evaluations by your veterinarian, often twice a year or more. Tooth extractions are also common to remove any painful teeth and improve the horse’s comfort.

With ongoing dental management and transitioning to a soft, palatable diet, many horses can thrive even with few remaining teeth. Managing these cases takes a dedicated owner, as there are typically additional time commitments and costs associated with dental disease-friendly diets.

Unfortunately, many horses with dental disease are euthanized due to their condition. Often this occurs when the horse is unable to consume any type of feed successfully, or due to time or financial strain on the owner.

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Prevention of Periodontal Disease in Horses

Preventing periodontal disease focuses on maintaining normal chewing function and minimizing the accumulation of feed between teeth.

Regular dental examinations are essential, as early detection and correction of dental abnormalities can reduce the risk of feed trapping. Most horses benefit from routine dental care one to two times per year, depending on age and individual needs.

Providing consistent access to appropriate forage supports natural chewing behavior and saliva production, both of which help maintain oral health. Selecting good-quality forage and avoiding excessively coarse or stemmy hay may also reduce risk. ^[7][14]

Monitoring eating behavior, body condition, and signs of feed wastage can help identify early changes that may indicate developing dental issues.

Balancing the Diet

For horses with periodontal disease, balancing the diet can be challenging because chewing ability, forage intake, and feed selection may all be affected. The feeding program must meet the horse’s nutrient requirements while supporting overall health, normal tissue maintenance, digestive function, and healthy body condition.

The feeding program needs to provide enough fiber, calories, protein, and micronutrients in a form the horse can chew and consume comfortably.

If hay is being replaced with soaked hay cubes, forage pellets, beet pulp, chopped forage, or a complete senior feed, the diet should be evaluated to make sure it still meets the horse’s requirements for calories, amino acids, vitamins, and minerals.

A poorly balanced soft diet can maintain intake in the short term but still leave the horse short on key nutrients, especially if the horse is selectively eating, wasting feed, or receiving only partial hay replacement. Inadequate calorie or protein intake can contribute to loss of body condition and muscle, while mineral and vitamin imbalances may affect overall health and tissue maintenance.

An equine nutritionist can help design a complete feeding plan for horses with missing teeth, poor chewing ability, or no functional teeth. These diets often rely on soaked mashes made from hay cubes, hay pellets, beet pulp, or complete feeds to replace long-stem forage while still meeting the horse’s complete nutrient requirements.

Diet plans for horses with advanced dental disease should pay careful attention to:

• Calorie density for horses losing weight or struggling to maintain condition
• Protein quality to support muscle maintenance, especially in senior horses
• Vitamin and mineral balance when forage sources are changed
• Starch and sugar levels for horses with metabolic concerns
• Water intake, especially when feeding soaked mashes or dry hay replacers

Because chewing ability can decline over time, the diet should be reassessed regularly. Monitoring body condition, topline, manure quality, feed waste, and eating behaviour helps determine whether the horse’s current feeding program is still appropriate.

Frequently Asked Questions

Here are some frequently asked questions about periodontal disease in horses:

Summary

Periodontal disease in horses is a progressive dental condition that affects the gums, periodontal ligament, and surrounding bone. It is most often caused by feed trapped between teeth, which leads to inflammation, infection, pain, and reduced chewing efficiency.

• Periodontal disease can develop gradually, so early signs such as slow eating, quidding, or feed packing may be easy to overlook
• Senior horses and horses with dental abnormalities, diastemata (gaps between teeth), or uneven wear patterns are at higher risk of developing periodontal disease
• Reduced chewing efficiency can affect forage breakdown, body condition, and digestive health over time
• Diagnosis requires a thorough oral examination by a veterinarian, and radiographs may be needed to assess deeper tissue or bone damage
• Treatment focuses on removing trapped feed, correcting dental abnormalities, and adjusting the diet when chewing becomes difficult
• Ongoing dental care and appropriate forage selection are important for managing recurrence and supporting long-term oral health