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Feline odontoclastic resorptive lesions (FORLs) is a disease in cats characterized by resorption of the tooth by odontoclasts, cells similar to osteoclasts. A FORL is also known as a neck lesion, cervical neck lesion, cervical line erosion, feline caries, or feline cavity. It is one of the most common disease of domestic cats, affecting up to two-thirds. FORLs have been seen more recently in the history of feline medicine due to the advancing ages of cats, but 800 year old cat skeletons have shown evidence of this disease. Purebred cats, especially Siamese and Persians, may be more susceptible.
FORLs appear as erosions of the surface of the tooth at the gingival border. They are often covered with calculus or gingival tissue. It is a progressive disease, usually starting with loss of cementum and dentin and leading to penetration of the pulp cavity. Resorption continues up the dentinal tubules into the tooth crown. The enamel is also resorbed or undermined to the point of tooth fracture. Resorbed cementum and dentin is replaced with bone-like tissue.