If you notice your cat drooling, this is highly abnormal and warrants a veterinary visit. Drooling is often due to underlying medical problems in cats such as:
Dental disease causing your cat to drool
Feline resorptive lesions (often called feline odontoclastic resorptive lesion or FORL) are a common cause of dental disease in cats, and result in significant oral pain and drooling. FORL, also called cervical line erosions, cavities, neck lesions, and external or internal root resorptions, can occur at the level where the gum line meets the tooth. Often times, FORL can be seen as a red line along the gum in your cat’s mouth. However, if your cat has a lot of tartar (hardened plaque) over the tooth, it may hide the gum lesion. FORL is extremely painful and can result in mouth sensitivity, fractures of the teeth, inappetance, a foul smell from the mouth, and drooling. Untreated, it can cause chronic pain in your cat and even weight loss.