Dental Disease & Periodontal Disease

The Importance of Dental Health

Oral health is one of the most important aspects of pet care in dogs and cats. Dental disease affects the tooth crown and roots. Periodontal disease affects the structures around the tooth. These structures are the gingiva (gums), periodontal ligament (the ligament that holds the tooth in position in the jaw), and alveolar bone (the bone of the tooth sockets and the jaw). Dental disease and periodontal disease affects 85% of dogs and cats over the age of 3.


Source: Today's Veterinary Practice Online

What is Periodontal Disease?

Periodontal disease all begins with the formation of plaque in the mouth. Plaque isn’t visible to the naked eye, and it is formed from food particles and bacteria mixed with saliva. Plaque attaches to the tooth surface, and can be removed from the tooth by brushing or chewing. If plaque is not removed adequately and regularly, then the bacteria in the plaque start to cause inflammation of the gingiva, causing gingivitis. Over time the plaque starts to mineralise into calculus and tartar, which cannot be removed by brushing or chewing and continues to harbour bacteria. If gingivitis is not managed and treated, then the inflammation and infection progresses and starts to breakdown other periodontal structures, which will eventually lead to teeth falling out. This is a painful process, and can have significant implications for overall health, often shortening the lifespan of our beloved companions.


The inflammation first affects the gingiva, and can lead to changes in its structure allowing more bacteria under the gum. As bacteria infect the tissue under the gum, it starts to breakdown the periodontal ligament that holds the tooth in position. This allows more bacteria to extend into the socket of the tooth, and come in contact with alveolar bone. The infection then eats away at bone, causing loss of important structures of the jaw. The bacteria infecting the periodontal structures will also enter the blood stream, which can lead to bacterial endocarditis (infection of the heart and valves), liver infections, and damage to the delicate structures of the kidneys.


There are some factors which may cause Periodontal Disease to develop more quickly in some individuals, such as:

  • Overcrowded teeth

  • Abnormal jaw occlusion (e.g. underbite or overbite)

  • Retained baby teeth (deciduous teeth)

  • Long hair around the mouth

  • Predominantly soft food diet

  • Immune suppression

  • Abnormal saliva enzymes in certain breeds or individuals (e.g. Maltese Terriers and Greyhounds)

Signs of Periodontal Disease

Initially, Periodontal Disease might not be visible if it is plaque only. Once the plaque starts to create gingivitis and calculus then we can start to see the signs.


Some owners may look at their pet’s teeth at home, and see the visible signs of Periodontal Disease.

Others first notice the early signs such as bad breath (halitosis), which is produced by oral bacteria. Some people notice a change in their eating habits, reporting that their pet chews on one side of their mouth, prefers wet food to dry food, or resents their mouth being touched. These can be signs of oral pain in some animals.


Many owners report that their pet “doesn’t seem painful because they are still eating”. Periodontal disease is painful, but many animals won’t show obvious signs of oral pain and will continue eating, even with severe oral disease. Almost every vet will tell you that they have seen many cases of horrific dental and periodontal disease in dogs and cats that are still eating. In those cases, once the dental and periodontal disease is treated, many owners will later say that their pet is suddenly livelier and more playful. We know from human dentistry that dental and periodontal disease is painful, and we determine the same to be true for our four-legged friends.


Periodontal Disease is graded on a scale of 1 to 4, with 1 being the lowest grade.

Grade 1 Periodontal Disease


Plaque will be present, and early signs of tartar may be developing on the teeth. The gingiva may be starting to become slightly red and slightly swollen with mild gingivitis. This level of Periodontal disease is often reversible with appropriate homecare and management.


Grade 2 Periodontal Disease

Tartar and calculus will be clearly visible on several teeth, with more pronounced gingivitis. The edges of the gingiva that meet the tooth will be noticeably red, and swollen. It is likely that mild oral pain is developing. This level of Periodontal Disease is often reversible with a professional veterinary scale and polishing procedure.

Dental Grades.png

Source: Olney-Sandy Spring Veterinary Hospital

Grade 3 Periodontal Disease

Significant tartar and calculus is present over multiple teeth, with significant gingivitis. The gingiva is red and swollen, and there will be some recession of the gingiva away from the tooth, exposing some of the tooth roots. Some teeth may be becoming loose. With Grade 3 disease, there is likely to be some bone loss, and is very likely to be causing significant oral pain. This level of Periodontal Disease requires a professional veterinary scale and polish procedure, and the change in the gingiva and bone are often irreversible, resulting in tooth extractions.


Grade 4 Periodontal Disease

Severe tartar and calculus is present over multiple teeth, with severe gingivitis. There is significant gingival recession, exposure of multiple tooth roots and the presence of multiple loose teeth. Oral pain is noticeable with Grade 4 disease, and there is irreversible damage to multiple teeth. This level of Periodontal Disease requires a professional dental procedure that will result in multiple tooth extractions, and may require other treatments such as pain relief and antibiotics.

Treatment & Prevention of Periodontal Disease

There are many, many options for oral care and periodontal disease prevention, and choosing the right method and/or product varies a lot on the individual animal.


The “gold standard” method of prevention and oral care is tooth brushing. While this may seem bizarre for our dogs and cats, it is the best way to remove food particles, bacteria and plaque from the teeth and gingiva. You can use small toothbrushes with soft bristles (such as a kids’ toothbrush) with pet toothpaste (not human toothpaste) or even just water to manually brush your pet’s teeth daily. Some people find that a rubber finger-brush is more user-friendly. We know that not all dogs and cats will tolerate tooth brushing, so there are lots of other options for periodontal disease prevention at home.


You can consider a dietary change. Dental-specific diets have been specially formulated to create a large kibble that encourages active chewing and therefore mechanical removal of plaque from the teeth. These diets are still nutritionally complete and balanced, ensuring that your pet receives the essential nutrition they need while providing dental and oral care. This option, however, relies on the animal effectively chewing. Some individuals will still insist on “hoovering” their food, barely chewing at all, meaning that the dental diets are not as effective.


Historically people have given their pets bones to chew for oral health. We don’t currently recommend giving bones for a number of reasons. Bones can be hard and can break teeth, causing other dental disease; they can cause gut disease such as pancreatitis, constipation and intestinal obstructions; and they can add significant calories to their daily intake, making weight management difficult. Many of the bones that are commonly given (chicken necks, chicken wings, etc.) have only small, soft bones, meaning that they are not as effective as a mechanical cleaning tool in the first place.


For those animals that love to sit down and chew, there is a huge range of safe and effective dental chew products available that are less likely to cause other health problems compared to bones.


But even an effective chewer will only chew with their back teeth. What about their front teeth?

There is a wide range of oral rinses and liquid products that can be added to drinking water to reduce bacteria numbers in the mouth, reducing the development of plaque. Other powder formulations can be added to food that are absorbed and secreted through the saliva to reduce bacteria numbers.


Sometimes a professional dental procedure is needed, even with oral health prevention on board. We clean our teeth every day, and we still should see our dentist once a year for a professional examination and clean. The same goes for our pets! Oral health prevention products will help reduce the development of plaque and periodontal disease, however it will not stop it completely. A dental scale and polish procedure with your vet is important in treating the mild periodontal disease that may be developing over time. Prophylactic dental procedures (i.e. done when only Grade 1 or 2) can reduce the likelihood of tooth extractions being required later on, and prevent a lot of pain and other disease (such as liver disease).


If oral health is already compromised, (e.g. Grades 3 and 4), then extraction of the affected teeth and other medical treatments are needed. By the time that tartar and calculus develops, our preventative treatments become either less effective or completely ineffective.

Tooth Fractures

Tooth fractures can occur in animals of any age in ways such as chewing hard objects, or trauma (e.g. impact with a hard object such as hit by a car). Some fractures involve only the crown of the tooth, and others can extend up through the roots of the tooth. Fractures that involve dentin are quite painful, and exposure of the pulp cavity risks bacteria entering the tooth root from the fracture site. For fractures involving the pulp chamber, a root canal can be performed by a specialist veterinary dentist and is considered a referral option. Some owners elect this option as a method of preserving the tooth as a whole, maintaining the function and cosmetic appearance of the tooth. Without referral for a root canal, the option for treatment of such a tooth is extraction. For fractures that involve the tooth root, extraction is the recommended treatment option to prevent infection extending into the tooth roots. Diseased tooth roots can cause abscesses and significant damage to the alveolar bone.

Pulp exposure in a fractured canine tooth

Source: Advanced Animal Dentistry

Feline Oral Resorptive Lesions (FORLs)

FORLs are a disease that results from abnormal activity of odontoclasts. Odontoclasts are cells that break down the structures of teeth and roots, and are normally only active during the change from deciduous (baby) teeth to adult teeth. Normally, they retain no function in an adult. In cats, however, stem cells found in the periodontal ligament can turn into odontoclasts in an adult, and start to break down the structures of healthy adult teeth. How and why this occurs isn’t fully understood, but it is reported that FORLS occur in up to 74% of cats over the age of 6! Signs of FORLs may be seen as uncharacteristically cranky or aggressive behaviour (due to pain), interest in food but reluctance or difficulty eating, mouth chattering after eating or drinking, or preference of chewing on one side. As the odontoclasts eat away at teeth, they expose the sensitive dentin and eventually the pulp of the tooth, causing intensely painful tooth lesions. Some of these lesions may be visible along the edge of the gingiva, but many occur beneath the surface. FORLs that occur along the tooth root aren’t visible to the naked eye, but are just as painful. Dental x-ray is needed to confidently identify all active FORLs in the cat’s mouth at the time of a dental procedure, if any are identified, the affected teeth must be extracted.

FORLs seen on dental x-ray

Source: The Cat Clinic, Ontario

Dentals & Anaesthetics

There is a growing trend of no-anaesthesia, non-veterinary dental procedures being performed. Many people claim they can clean an animal’s teeth and provide the same level of care without the need for anaesthesia or veterinary training. This runs a great risk of not identifying significant dental and periodontal disease, and therefore not adequately or appropriately treating it. Without anaesthesia we can only hope to clean the crown of the tooth, but as we have discussed in this information sheet, periodontal disease affects the structures around the tooth and the roots. Anaesthesia is needed to be able to effectively explore and clean the structures beneath the gingiva without causing significant stress, discomfort and pain to the animal. Tooth extraction is an invasive procedure, and whilst we give local anaesthetics for the focal pain at the tooth site, a general anaesthetic in required to keep the animal still and relaxed during the procedure.

Anaesthesia is essential in order to perform a comprehensive oral examination, adequately perform an effective dental scale and polish, and treat dental and periodontal disease.


If you are concerned about anaesthesia for your pet, then please come in and speak with your vet about what is involved and the options available.

Example of a diseased tooth following inappropriate management with non-anaesthesia dental cleaning. The crown of the tooth has been cleaned, but the structures below the gum line have not be managed or treated and have become severely diseased resulting in extraction of the tooth.

Source: Arizona Veterinary Dental Specialists

If you have any further questions regarding oral health, dental care or dental treatment, please contact our friendly staff on 07 3297 0803, or come in and speak with us.