Why Is Your Teeth Aching? Explained

Tooth pain can stop you in your tracks. It might be a dull ache that lingers or a sharp jolt when you bite. The direct answer: most toothaches happen when the nerve inside a tooth or the tissue around it gets irritated. Common causes include tooth decay, infection, gum disease, injury, or even sinus pressure. Understanding why your teeth hurt is the first step to getting the right relief.

What Causes a Toothache?

A toothache is not a disease itself. It is a symptom of an underlying problem. The most common cause is dental caries — holes in the tooth from bacteria. When decay reaches the inner layer called dentin, it can cause sensitivity. If it gets deeper into the pulp where nerves and blood vessels live, the pain becomes stronger.

Other frequent causes include:

• Pulpitis: Inflammation of the tooth pulp, often from untreated decay or trauma.
• Tooth abscess: A pocket of pus caused by bacterial infection. This can be very painful and requires urgent treatment.
• Gum disease: Inflammation of the gums can make teeth feel tender or loose.
• Tooth fracture: A crack can expose the inner layers of the tooth to air and bacteria.
• Bruxism: Grinding or clenching your teeth wears down enamel and can cause jaw and tooth pain.
• Sinusitis: Congestion and pressure in the sinuses can cause pain that feels like it comes from your upper teeth.

How Does Tooth Decay Lead to Pain?

Tooth decay starts when bacteria in your mouth turn sugar into acid. This acid slowly eats away at the hard outer layer called enamel. Once enamel is broken, the dentin underneath becomes exposed. Dentin has tiny tubes that connect to the nerve. Hot, cold, sweet, or sour foods can trigger pain.

If decay reaches the pulp, the nerve becomes inflamed. That inflammation causes a throbbing pain that may stay even after the trigger is gone. Eventually the nerve may die, and the pain may stop temporarily — but infection can still spread to the jaw and other areas.

Can Gum Disease Cause Tooth Pain?

Yes. Gum disease, also called periodontal disease, is an infection of the tissues that hold your teeth in place. In the early stage, called gingivitis, the gums may bleed and feel sore. In more advanced periodontitis, the gums pull away from the teeth, forming pockets that collect bacteria. This can lead to tooth loosening and pain when chewing.

The pain from gum disease is usually a dull ache, not a sharp jolt. It may feel like the tooth is tender or slightly loose. Treatment focuses on cleaning below the gum line and improving oral hygiene at home.

Why Do My Teeth Hurt When I Bite Down?

Pain when biting down often points to a problem inside the tooth or around its root. Common reasons include:

• Dental abscess: Infection at the root tip causes pressure that hurts when you press on the tooth.
• Tooth fracture: A cracked tooth may not hurt all the time but will hurt when you bite and release.
• Pulpitis: Inflamed pulp can cause pain when the tooth is tapped.
• Recent dental work: After a filling or crown, the bite may be slightly high, causing temporary discomfort.

If the pain is sharp and comes and goes with pressure, see a dentist. An x-ray can often show the cause.

Why Is Your Teeth Aching? Explained — The Role of Sinus Pressure

Sometimes tooth pain is not from the teeth at all. The maxillary sinuses sit just above the upper back teeth. When you have sinus congestion from allergies or a cold, the lining of the sinuses swells. This puts pressure on the roots of those upper molars. The pain can feel exactly like a toothache.

How can you tell? If all your upper teeth on one side ache at the same time, and you also have a stuffy nose or headache, sinusitis may be the cause. Bending over may make the pain worse. A dentist or doctor can help distinguish sinus pain from a true dental problem.

When Should You See a Dentist for Tooth Pain?

Any tooth pain that lasts more than a day or two should be evaluated. See a dentist right away if you have:

• Pain that is severe or throbbing
• Swelling in your face or jaw
• Fever
• Difficulty breathing or swallowing
• A bad taste in your mouth, which may mean an abscess has drained

Dental infections can spread to other parts of your body and become serious. Pain relievers like ibuprofen can help temporarily, but they do not treat the cause. Antibiotics may be needed for an infection, but a dentist must decide based on exam findings.

Can a Toothache Be a Sign of Something Else?

Yes, but this is less common. Heart attacks can sometimes cause pain that radiates to the jaw or teeth. This is more likely if you also have chest pain, shortness of breath, nausea, or sweating. If you have risk factors for heart disease and get sudden jaw pain with exertion, seek emergency care.

Temporomandibular joint (TMJ) disorders can also cause jaw and tooth pain. This pain often comes from the muscles around the joint rather than the teeth themselves. Clenching or grinding your teeth at night can tighten these muscles and cause a dull ache that is hard to pinpoint.

What Can You Do for Tooth Pain at Home?

Home care can only provide temporary relief. It does not cure the underlying problem.

• Rinse your mouth with warm salt water to clean the area and reduce mild swelling.
• Use over-the-counter pain relievers like ibuprofen or acetaminophen. Follow the label directions.
• Apply a cold pack to the outside of your cheek for 15-minute intervals if there is swelling.
• Avoid very hot, cold, or sugary foods and drinks that may trigger pain.
• If a filling has fallen out, a temporary dental cement from a pharmacy can cover the exposed area until you see a dentist.

Do not put aspirin directly on your gum or tooth. It can burn the tissue and make things worse.