As the name implies resorptive lesions only happen in cats.
It is not a cavity because those are caused by bacteria. These lesions are caused by abnormal activity by normal cells in the mouth. It is similar to the process of the body’s natural function to remove baby teeth which is only supposed to happen as a kitten and stop as they mature.
Unfortunately most of the damage occurs below the gum line before we see physical changes in the tooth. Radiographs can be helpful in diagnosing these teeth abnormalities. It is very painful and extractions are often needed.
You may notice your cat pawing at its mouth, redness of the gums, drooling or a decrease in appetite. However, most of the time your cat will show NO SIGNS at all. An exam with the veterinarian can help determine if your cat may have resorptive lesions or other oral disease present. Due to the amount of pain involved with this disease it’s important to have their teeth assessed as soon as possible once a lesion is suspected.