A closer look: Feline Odontoclastic Resorption Lesions (FORLS) in Cats
It is common for FORLs to go unnoticed. Sometimes a cat with FORLs changes their eating habits. They may try to swallow dry food without chewing, or tilt their head in such a way as to avoid using an affected tooth. The cat may prefer eating wet food if the option is available.
In extreme cases where an eroding tooth causes pain, or if several teeth are affected, the cat may exhibit a reduced appetite.
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FORLs are very common in cats, and become more so as a cat grows older.
The condition is not an emergency, although an affected tooth is usually extremely painful when touched. Dental surgery is required to remove any affected teeth.
FORLs are idiopathic, meaning they have no known origin or root cause. Some theories suggest that vitamin D deficiency or progression of periodontal disease is responsible, however there is currently no consensus among the veterinary community.
Early FORLs look like a tiny pink spot in the dental enamel. A tooth that is affected by FORLs gradually grows darker, with a reddish or brown color resembling dried blood expanding across the surface of the tooth, typically starting at the root of the tooth.
Over time the tooth appears to wear away, sometimes accompanied by inflammation of the gums. In the final stages, the tooth is completely resorbed, leaving only a bump beneath the gums in place of where the tooth was originally.
Testing and diagnosis
A physical examination is often sufficient to diagnose FORLs, however initial symptoms often appear below the gumline. Dental x-rays are required to determine how many teeth are affected.
Steps to Recovery
As there is no known treatment preventing or reducing FORLs, veterinary assistance relies on removing the affected teeth to reduce pain and discomfort for the cat.
If FORLs have progressed to a point where a tooth is completely resorbed but no other teeth are affected, no treatment is necessary.
When one FORL is noticed, dental X-rays often reveal multiple affected teeth. Recurrence of FORLs is common.
FORLs are not known to be contagious, and there are no known ways to prevent the condition.
Are Feline Odontoclastic Resorption Lesions (FORLS) in Cats common?
FORLs are very common in cats. Incidence rate estimates range from 20%-75% of cats being affected, with the percentage increasing with the cat’s age.
Removal of the affected teeth