Why Do My Teeth Hurt? Causes And Treatment

Tooth pain is your body’s way of telling you that something in your mouth needs attention. It ranges from a dull ache to sharp, throbbing pain that disrupts sleep and concentration. The cause is often decay or damage, but it can also stem from your sinuses, gums, or even stress. Identifying the specific type of pain you feel is the first step toward finding the right treatment and getting relief.

What Causes Sudden Tooth Pain?

Sudden, sharp pain usually has a direct trigger. It often means a nerve inside the tooth is exposed or irritated. The most common cause is a cavity that has reached the dentin, the layer beneath the hard enamel. Dentin contains tiny tubes that lead directly to the nerve, so hot, cold, or sweet foods can cause a sudden, shooting pain.

Another frequent cause is a cracked or fractured tooth. You might not see the crack, but it can expose the inner layers of the tooth to pressure and temperature changes. Biting down on something hard can create a sharp pain that disappears quickly when you release the pressure. Gum recession can also expose the root surface, which is not protected by enamel and is highly sensitive to touch and temperature.

Why Do My Teeth Hurt? Causes And Treatment for Different Pain Types

The character of your pain gives strong clues about its source. A brief, sharp pain when you eat something cold often points to a small cavity or exposed root. A dull, constant ache that lasts for hours after eating might indicate deeper decay or an abscess. Throbbing pain that keeps you awake at night is a serious sign that the nerve inside the tooth is dying or already dead.

Treatment depends entirely on the cause. For a small cavity, a dentist will remove the decay and place a filling. For a cracked tooth, the treatment varies from a simple filling to a crown, depending on the crack’s severity. If the nerve is infected, a root canal is often necessary. This procedure removes the infected tissue, relieves pain, and saves the tooth from extraction. Over-the-counter pain relievers can manage symptoms temporarily, but they do not treat the underlying problem. You need to see a dentist for a proper diagnosis and permanent fix.

Why Does My Tooth Hurt When I Bite Down?

Pain that occurs only when you bite or chew is often related to pressure. This is a different mechanism than temperature sensitivity. The most common cause is an abscess or an infection at the root tip. When you bite, the pressure pushes against the infected tissue, causing a sharp pain. The tooth may also feel like it is “higher” than the others, and it may be tender to the touch.

Another cause is a cracked tooth that opens slightly when you apply pressure. Sinus pressure can also make your upper back teeth hurt when you bite, as the roots of these teeth sit very close to the sinus floor. If the pain is consistent and localized to one tooth, it is likely a dental issue. If it affects multiple teeth on one side, especially alongside facial pressure, sinusitis may be the culprit. A dentist can take an X-ray to see the root structure and confirm the source of the pressure pain.

Can Sinus Pressure Make Your Teeth Hurt?

Yes, it can. The roots of your upper molars and premolars are located in the maxillary bone, directly beneath the maxillary sinus cavity. When you have a cold, allergies, or a sinus infection, the lining of the sinus can become inflamed and swollen. This inflammation puts pressure on the nerve endings around the tooth roots.

This pain usually feels like a dull, generalized ache in the upper back teeth on both sides of your face. It often worsens when you bend over or move your head quickly. The key difference from dental pain is that sinus-related tooth pain is not triggered by hot or cold foods. If your teeth hurt alongside nasal congestion, facial pressure, and a headache, your sinuses are a likely cause. The pain should subside as the sinus infection clears. If the tooth pain persists after your sinuses improve, you need to see a dentist.

How to Stop Tooth Pain at Home

Home care is for temporary relief only. It cannot fix a cavity, a crack, or an infection. However, it can help you manage the pain until you can see a dentist.

None of these remedies treat the infection. If you have swelling in your face or a fever, you need urgent dental care. An untreated dental infection can spread to other parts of your head and neck, which is a serious medical emergency.

When Is a Toothache an Emergency?

Most toothaches can wait for a regular dental appointment, but some situations require immediate care. You should seek urgent treatment if you have severe pain that over-the-counter medication cannot control. You should also seek immediate care if you have swelling in your face, jaw, or neck, or if you have a fever alongside the tooth pain. These are signs of a spreading infection.

A tooth that is knocked out, loose, or severely cracked also requires emergency attention. If a tooth is knocked out, hold it by the crown, rinse it gently if dirty, and try to place it back in the socket. If that is not possible, keep it in a glass of milk and get to a dentist within 30 minutes. Bleeding from the mouth that does not stop with pressure is also an emergency. When in doubt, call your dentist’s office. They can advise you on whether your situation needs immediate attention or can wait for a scheduled appointment.

What Happens If You Ignore a Toothache?

Tooth pain rarely resolves on its own. If the cause is decay, it will continue to spread deeper into the tooth. Eventually, the bacteria will reach the pulp, the soft tissue inside the tooth that contains nerves and blood vessels. This causes an infection. The body’s immune response and the pressure from pus inside the tooth cause severe, throbbing pain.

If the infection is not treated, it can travel down the root and form an abscess at the tip. An abscess is a pocket of pus. It can cause swelling in the jaw and face. In severe cases, the infection can spread to other parts of the body, leading to a serious condition called sepsis. This is why a persistent toothache is not something to “wait out.” Early treatment is simpler, less painful, and less expensive than treating a late-stage infection.