A tooth that hurts when you bite down usually has a problem that pressure makes worse. Common causes include a deep cavity, a crack, an infection at the root, a filling or crown that sits too high, or irritated gums around the tooth. Less often, sinus pressure or teeth grinding is to blame. Several of these causes feel alike, so an exam and X-rays are the fastest way to find the source and stop the pain.
Biting pushes a tooth slightly down into its socket and flexes the enamel. If the nerve inside is inflamed, or the tissue around the root is swollen, that small movement triggers pain.
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The type of pain offers clues. Sharp pain that stops when you release your bite often points to a crack. A dull ache that lingers suggests infection or inflammation.
Decay that moves past the enamel exposes the softer layer underneath and, eventually, the nerve. Chewing forces food and pressure into the damaged area. Our Cavity treatment removes the decay and seals the tooth before it spreads deeper.
A crack may be too small to see. When you bite, the pieces separate slightly and pinch the nerve. Pain often hits when you release the bite. Sensitivity to cold is common too.
An abscess is a pocket of infection at the root tip or in the gum. Pressure on the tooth presses on that pocket. Throbbing pain, swelling, a bad taste, or a bump on the gum are warning signs.
A new filling or crown that sits slightly too tall takes the full force of every bite. The tooth often becomes sore within a few days. A quick adjustment usually solves it.
Old fillings can crack, wear down, or pull away from the tooth. Bacteria and food slip underneath, and the tooth flexes when you chew. A Loose filling should be replaced before decay forms beneath it.
Infected or swollen gums weaken the support around a tooth. The tooth may feel loose or tender when you chew. Gums may also bleed when you brush.
When gums pull back, part of the root is exposed. Roots have no enamel covering them. Pressure, cold drinks, and sweets can all cause a sharp twinge.
Clenching or grinding, often during sleep, overloads the teeth and the ligaments that hold them. Teeth may feel bruised in the morning. Over time, grinding can also crack teeth.
The roots of the upper back teeth sit close to the sinuses. A cold or allergies can make several upper teeth ache when you bite or bend over. Sinus pain usually affects more than one tooth at once.
Our dentists start by asking when the pain began, what triggers it, and how long it lasts. A Dental exam reveal decay, bone changes around a root, and signs of infection that cannot be seen in the mouth.
X-rays do not always show cracks. Our dentists may tap on teeth, have you bite on a small tool one point at a time, test cold sensitivity, and check how your teeth meet. Narrowing the pain to one tooth guides the right treatment.
Chew on the other side of your mouth.
Choose soft foods and skip very hot, cold, or sticky items.
Rinse with warm salt water to keep the area clean.
Take an over-the-counter pain reliever as directed on the label.
Hold a cold compress on your cheek if there is swelling.
Never place aspirin directly on the gums, since it can burn the tissue.
These steps ease discomfort for a short time. They do not fix the cause.
Get seen the same day if you notice any of these signs:
Swelling in the face, jaw, or gums
Fever along with tooth pain
Pain that wakes you up or keeps getting worse
A broken tooth, or a filling or crown that fell out
A bad taste or pus near the tooth
Swelling that spreads toward the eye or neck, or makes it hard to swallow or breathe, needs a hospital emergency room right away.
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We provide same-day Toothache care seven days a week, including evenings and weekends. Someone answers our phones 24 hours a day.
Cavities, worn fillings, and small chips are repaired with a filling. A cracked tooth or broken crown may need a crown repair or a temporary crown to hold the tooth together. If a filling or crown sits too high, our dentists can reshape it.
When decay, a deep crack, or infection reaches the nerve, a Root canal removes the damaged tissue and saves the tooth. Lingering pain on biting is one of the most common reasons for this treatment.
A Dental abscess needs prompt care to relieve pressure and control the infection. Treatment clears the infection and then addresses the tooth that caused it.
If a tooth is cracked below the gumline or too damaged to save, removing it ends the pain. Tooth extraction are among the treatments we perform most often.
A filling or crown that hits too hard can be adjusted during your visit. If grinding is behind the soreness, our dentists can point out the signs and explain how a night guard protects teeth over the long term.
Swollen, painful gums often improve with a thorough dental cleaning and steady home care. When a gum infection forms an abscess, we treat it the same day.
Brush twice a day with fluoride toothpaste and clean between your teeth daily.
Avoid chewing ice, hard candy, pens, and popcorn kernels.
Ask about a night guard if you clench or grind.
Replace worn or cracked fillings before they fail.
Keep up with routine checkups so small cavities are treated early.
Wear a mouthguard during contact sports.
The answer to “Why Does My Tooth Hurt When I Bite Down?” is almost always a problem inside or around the tooth. Cavities, cracks, infections, high fillings, gum problems, grinding, and sinus pressure are the usual causes. Home care can help you get through the day, but an exam and X-rays find the real source. Our dentists provide same-day care seven days a week so you can chew comfortably again.
October 21, 2026
