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Normal Feline Teeth
Feline Odontoclastic Resorptive Lesions (FORLs)
Feline Odontoclastic Resorptive Lesions occur in 72% of cats over 5 years of age, according to the American Veterinary Dental Forum. If your cat shows signs of hypersalivation, oral bleeding, or has difficulty chewing, the symptoms may be a result of a FORL. On the other hand, most cats don't show any sign of pain or discomfort.
FORLs (cat cavities) occur when odontoclast cells found in the defects cause the tooth to dissolve. The exact cause of FORLs is unknown but plaque appears to be a major factor. Although FORLs can appear on any tooth, they are most commonly found on the lower premolars.
There are several stages to FORL development:
Stage 1:
  
A defect in the enamel is visible. Since the lesion hasn't penetrated the dentin, the tooth sensitivity is low. Treatment at this stage involves a dental cleaning including a thorough cleaning, polishing and smoothing of the tooth defect.
Stage 2:
 
At this stage, the lesion enters the enamel and dentin with increasing sensitivity.
Stage 3:
 
In stage 3, the lesion has entered the pulp chamber and requires x-rays to determine the status of the tooth. At this point, it is extremely painful as well as easy access for bacteria to enter and form an abscess. This could further lead to infection of vital organs of the body.
Stage 4:
  
The crown of the tooth has been damaged or erroded away. Gum tissue grows over the remainder leaving a painful bloody lesion. Extraction of fragments is necessary if the lesion appears inflammed or painful.
It is important to check for FORLs monthly using a q-tip and placing it where the tooth meets the gums. If pain or bleeding occur, visit your veterinarian for further examination.
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Dr. Maureen Flatley