Feline odontoclastic resorptive lesion

Feline odontoclastic resorptive lesion, often shortened to FORL, is a syndrome in cats in which the tooth is resorbed by odontoclasts, cells similar to the osteoclasts that break down bone. It is also called feline tooth resorption, neck lesion, cervical line erosion, feline caries or feline cavity, and it is one of the most common diseases of domestic cats, affecting up to two thirds of them. Cat skeletons 800 years old show evidence of it, and purebred cats, especially Siamese and Persians, may be more susceptible. The lesions appear as erosions at the gum line and progress from loss of cementum and dentin into the pulp cavity, until the enamel is undermined and the tooth can fracture. This is a veterinary condition recorded here as described, not advice.