You notice your cat licking his lips. You assume he just finished a messy meal, or maybe he is working through a hairball. You wait. You watch. You tell yourself it is nothing. But what if it is not a quirk at all? What if that repetitive lip-licking is the single most reliable early warning sign of dental disease, and your cat is actively in pain right now? My cat keeps licking his lips is the exact phrase owners type into Google when they finally realize something is wrong. This checklist separates benign mouth irritation from life-threatening oral emergencies.
Most owners miss dental disease until it is advanced. The American Veterinary Medical Association estimates that by age three, nearly 70% of cats show clinical signs of periodontal disease. The problem is that cats are evolutionary masters at hiding pain. In the wild, a cat with a sore mouth cannot hunt. A cat that cannot hunt does not survive. So your domestic cat has inherited the instinct to mask suffering until it becomes unbearable.
Lip licking is not a cat’s normal behavior. It is a specific, highly visible signal of oral discomfort. When you see it, you are not looking at a quirky habit. You are looking at a cat trying to manage pain, nausea, or a physical obstruction. The trick is knowing which one it is, and when it crosses the line from “watch and wait” to “call the vet now.”
The Dental Pain Checklist: What to Look For
Dental disease in cats rarely presents as a visibly broken tooth. It presents as a slow, silent erosion of the supporting structures of the mouth. The most common form is feline odontoclastic resorptive lesion, commonly known as FORL. These lesions start at the gumline, slowly eating away at the enamel and dentin of the tooth. To the untrained eye, the tooth looks normal. To the cat, it feels like a sharp shard of glass embedded in the gum.
When you are trying to figure out if your cat’s lip licking is dental-related, look for these specific signs. They are the markers that separate a minor irritation from a chronic, painful condition.
- Chattering or clicking sounds: If your cat makes a chattering noise while looking at food, or clicks his jaw when you try to pet his face, he is likely experiencing sharp pain at the gumline. This is a classic sign of FORL.
- Food dropping: Watch your cat eat. Does he pick up a piece of kibble, chew once, and then drop it on the floor? Does he hold food in one side of his mouth and swallow it whole? This is not pickiness. This is a cat trying to avoid triggering a painful tooth.
- Bad breath (halitosis): A slightly smelly mouth is normal for a cat. A mouth that smells like rotting meat or ammonia is a sign of active infection. If the odor is sudden and severe, it indicates advanced periodontal disease or a dying tooth root.
- Red or bleeding gums: Gently lift the lip. Healthy gums are a pale pink. Inflamed gums are bright red, swollen, or bleed at the slightest touch. This is gingivitis, the precursor to permanent bone loss.
- Reluctance to be touched near the face: If your cat pulls away when you stroke his cheeks or try to open his mouth, he is protecting a painful area. This is often the first sign owners notice, long before they see the lip licking.
If you see two or more of these signs alongside the lip licking, you are not dealing with a simple irritation. You are dealing with active dental disease that requires professional intervention. Ignoring it will not make it go away. It will only allow the infection to spread to the jawbone and, in severe cases, into the bloodstream.
When Lip Licking Means Nausea, Not Pain
Not all lip licking is dental. In fact, nausea is one of the most common causes of repetitive lip smacking in cats. The two can look identical from a distance, but the context clues are different. When a cat is nauseous, the lip licking is usually accompanied by excessive drooling (ptyalism) and a frequent swallowing motion. The cat may also lick the air, his paws, or his flank repeatedly.
Nausea in cats is rarely a primary condition. It is almost always a symptom of something else. The most common underlying causes include chronic kidney disease, hyperthyroidism, inflammatory bowel disease, or a gastrointestinal obstruction. If your cat is licking his lips and also drinking more water than usual, or if he has lost weight despite eating normally, the nausea is likely systemic, not oral.
The key differentiator is the cat’s reaction to food. A cat with dental pain will often want to eat but will struggle to chew. He may approach his bowl, sniff the food, and then walk away. A cat with nausea will often show no interest in food at all. He may approach the bowl, take a single bite, gag, and then refuse to go back. This distinction is critical for your vet to know, because the treatment for a tooth abscess is completely different from the treatment for kidney failure.
When to Call the Vet: The Red Flags
There are moments when lip licking crosses the line from “monitor at home” to “emergency room.” You do not need to wait for a scheduled appointment if your cat exhibits any of the following signs. These are the markers of a life-threatening emergency that requires immediate veterinary intervention.
Complete refusal to eat or drink: If your cat has not eaten or drunk water in 24 hours, you are in dangerous territory. Cats are uniquely susceptible to hepatic lipidosis, a potentially fatal liver condition that can develop when a cat stops eating for even a few days. If the lip licking is accompanied by a complete refusal to approach his food bowl, call your vet immediately.
Visible foreign objects: If you can see a string, a piece of plastic, or a sharp object lodged in the roof of the mouth or under the tongue, do not try to remove it yourself. You risk pushing it deeper or causing severe tissue damage. This requires professional extraction.
Swelling or asymmetry: If one side of your cat’s face looks swollen, or if he is drooling blood-tinged saliva, he may have an abscessed tooth root or a severe infection. These infections can spread to the brain or bloodstream if left untreated. Do not wait. Seek care.
Difficulty breathing: If the lip licking is accompanied by open-mouth breathing, gasping, or wheezing, this is a respiratory emergency. Swelling in the mouth can obstruct the airway. This requires immediate emergency veterinary care.
When in doubt, trust your gut. You know your cat’s baseline behavior better than any checklist. If the lip licking is new, persistent, and accompanied by any change in eating or drinking habits, it is always better to err on the side of caution. Dental disease is painful, treatable, and common. Ignoring it is not.
What to Do Next: The Resolution
If your cat’s lip licking is persistent, the resolution is not home remedies. It is a professional veterinary dental exam. This is the specific lever that ends the uncertainty. A vet can perform a thorough oral exam, often under sedation, to see below the gumline where the damage is actually happening. They can take dental radiographs (X-rays) to identify FORL, root abscesses, and bone loss that are invisible to the naked eye.
Once the underlying cause is identified, the treatment is straightforward. For dental disease, this usually means a professional cleaning and the extraction of any damaged or resorbing teeth. Cats adapt remarkably well to tooth extractions. They do not need their back teeth to swallow food whole, and most cats return to normal eating within 24 to 48 hours of the procedure. The relief from chronic pain is often immediate and dramatic.
For nausea, the treatment depends on the underlying cause. Blood work can rule out kidney disease, hyperthyroidism, and liver issues. If those are clear, your vet may recommend an ultrasound to look for inflammatory bowel disease or foreign bodies. The goal is to treat the root cause, not just the symptom.
The bottom line is this: lip licking is your cat’s way of telling you something is wrong. It is a symptom. And it is a symptom you can act on. The next time you see your cat licking his lips, do not look away. Look closer. Use this checklist. And if the signs point to pain or nausea, make the call. Your cat’s comfort depends on it.
Frequently Asked Questions
How often should I check my cat’s teeth?
You should perform a visual check of your cat’s teeth and gums every month. Lift the lip, look for redness, swelling, or broken teeth, and smell for bad breath. If you notice any changes, schedule a veterinary exam.
Can dental disease cause my cat to stop drinking water?
Yes. If the pain is severe enough, a cat may associate drinking water with pain if the water hits a sensitive tooth or gumline. However, a complete refusal to drink water is more often a sign of kidney disease or diabetes. Your vet can distinguish between the two with blood work.
Is it normal for my cat to lick his lips after eating?
Occasional, brief lip licking after a messy meal is normal. Persistent, repetitive licking that continues long after the meal is finished is not. It indicates ongoing discomfort or nausea.
What is feline odontoclastic resorptive lesion (FORL)?
FORL is a painful condition where the body’s own cells break down the tooth structure, starting at the gumline. It is extremely common in cats and requires professional dental treatment, usually involving extraction of the affected teeth.
Can stress cause my cat to lick his lips?
Stress can cause gastrointestinal upset, which leads to nausea, which leads to lip licking. If your cat has recently moved, added a new pet, or changed his routine, stress could be the underlying trigger. However, always rule out physical causes first.
Sources & Further Reading
- Veterinary Dental Disease in Cats — American Veterinary Medical Association
- Feline Odontoclastic Resorptive Lesions: A Review — VIN (Veterinary Information Network)
Photo by Iván Antonio on Unsplash.