What causes a numb chin and lower lip without recent dental work?

If your chin or lip feels numb, it can be worrying, but it's usually caused by something straightforward, like a tooth or jaw infection, an injury or pressure on a nerve. Rarely, it can point to something more serious, like a tumor. Either way, new numbness with no clear cause should be checked promptly. 

What you will learn in this article: 

• A nerve in your lower jaw carries feeling from your chin and lower lip. 

• Dental treatment, infection or injury can affect this nerve. 

• In rare cases, unexplained numbness can be linked to a tumor. 

• A dental provider can check for a dental cause and help you decide whether you need medical care. 

Not sure what's causing the sensation? Schedule an appointment with an Aspen Dental provider. Your dental provider can check your teeth and jaw and help find out what may be causing it. 

What nerve controls feeling in your chin and lip? 

The feeling in your lower lip and chin comes mainly from the mental nerve. It is the end part of the inferior alveolar nerve, which runs inside the lower jaw before reaching a small opening called the mental foramen. A review in Frontiers in Neurology notes that a problem along this nerve pathway can change feeling in the area.¹ You may notice numbness, tingling or pins and needles. 

Can dental work cause a numb chin and lip? 

Yes. A report in the Journal of Dental Anesthesia and Pain Medicine says numbness can follow a numbing injection, root canal treatment or surgery in the lower jaw. Symptoms often begin after the numbing medicine wears off, although they can start later. Most cases improve on their own, but recovery can take days, weeks or months, and full healing isn't guaranteed in every case. Direct nerve injury or pressure from swelling or a pocket of blood called a hematoma are reported causes.² 

Even a routine filling can leave your tongue or lip sore or numb while the numbing wears off. Contact your dental provider promptly if the numbness lasts longer than expected, gets worse or starts after normal feeling had returned. 

What causes numbness without recent dental work? 

Sometimes numbness starts even when you have not had recent dental work. Several possible causes can be involved.¹ These include: 

• A tooth or jaw infection, such as an abscess or an infection in the jawbone.

• An injury that affects a nerve in the lower jaw

• A health problem that affects nerves, such as diabetes or certain brain or nerve conditions

• Rarely, a tumor in or near the jaw, or cancer that has spread there

This list does not cover every possible cause. A dental provider or doctor needs to examine you to find the reason. 

Why is numb chin syndrome taken seriously? 

Numb chin syndrome is the medical name for numbness or changed feeling in the chin and lower lip along the mental or inferior alveolar nerve. It can happen after dental care, so the name is not limited to cases with no recent dental work. 

Most cases have a dental cause, such as infection, injury or tooth removal. Researchers also warn that numb chin syndrome can sometimes be the first sign of cancer or a sign that known cancer has spread. They recommend a prompt exam when there is no clear dental cause.¹ 

This does not mean unexplained numbness is usually cancer. It means the symptom should not be ignored, especially if it gets worse, does not improve after dental treatment or you have a history of cancer. 

When should you see a dental provider about numbness? 

Call a dental provider promptly if the numbness begins for no clear reason, lasts longer than the numbing medicine from dental care should last, gets worse or starts after normal feeling had returned. Do not wait several weeks before telling your dental provider. 

Tell your dental provider about pain, swelling, loose teeth, a lump, fever or trouble opening your mouth. Also tell them if you have had cancer. Your dental provider may examine your teeth and jaw, test the feeling in the area and take an X-ray. If the cause is not clear, they may suggest more imaging or refer you to a doctor or specialist. 

A numb chin or lip deserves a prompt check. Schedule an appointment with your dental provider to find out what may be causing it. 

What causes a numb chin and lower lip? FAQs 

Still have questions about chin and lip numbness? These answers cover a few common concerns. 

How long does numbness last after a dental procedure? 

Once numbing medicine wears off, unexpected numbness may get better in days. Some nerve injuries take weeks or months. Do not wait for a set number of weeks before speaking up. Call your dental provider as soon as you notice numbness that lasts longer than expected, gets worse or starts after normal feeling returned. 

Can numbness go away on its own? 

Some mild nerve irritation gets better as swelling goes down and the area heals. But numbness can continue or need treatment, depending on its cause. A dental provider can check for a dental problem and refer you if needed. 

Can stress or anxiety cause a numb chin or lip? 

Stress can cause many body sensations, but numbness limited to your chin or lower lip can also have dental or medical causes. Do not assume stress, clenching or a temporomandibular joint (TMJ) problem is the reason. Have new or lasting numbness checked. 

Should you go to urgent care or a dental provider first? 

If the numbness is limited to your chin or lip and you do not have emergency signs, call a dental provider promptly. If it starts suddenly with a weak or drooping face, weakness in an arm or leg, speech problems, vision changes, dizziness, trouble walking or sudden severe headache with no known cause, call 911. The Centers for Disease Control and Prevention lists these as warning signs of a stroke.³ Also seek emergency care for trouble breathing or swallowing or for facial swelling that is growing quickly. 

What tests might a dental provider run? 

Your dental provider may examine your teeth, gums and jaw and test the feeling in the numb area. They may take an X-ray to check for an infection or changes in the jaw. If an X-ray does not explain the numbness, your dental provider may recommend a CT or MRI scan or refer you to a doctor or specialist. 

Sources 

¹ National Institutes of Health, PubMed Central, Frontiers in Neurology: “Numb Chin Syndrome Leading to a Diagnosis of Salivary Ductal Adenocarcinoma: A Case Report and Review of the Literature.” https://pmc.ncbi.nlm.nih.gov/articles/PMC5526228/ 

² National Institutes of Health, PubMed Central, Journal of Dental Anesthesia and Pain Medicine: “Delayed paresthesia of inferior alveolar nerve after dental surgery: case report and related pathophysiology.” https://pmc.ncbi.nlm.nih.gov/articles/PMC6031975/ 

³ Centers for Disease Control and Prevention, Stroke: “Signs and Symptoms of Stroke.” https://www.cdc.gov/stroke/signs-symptoms/index.html