Tooth necrosis is an old name for the disease that is now called FORL. FORL (Feline Odontoclastic Resorptive Lesions) is a progressive disease, which means that once the disease manifests at one element, over time, more and more teeth will be affected. The teeth are then affected at the transition between the crown of the teeth (above the mucous membrane) and the root of the tooth (below the mucous membrane). The lesions are caused by tooth dissolving cells (odontoclasts), which induce the resorption (breakdown) of the tooth tissue.
