Tooth pain: why it happens and what to do

If a tooth hurts, it helps to start with one clear idea: that pain is almost always signaling that something needs attention, and it rarely goes away on its own. Sometimes it eases for a few days and comes back, and many people read that pause as recovery when the problem is actually still advancing underneath. I'm Valentina Gormaz, an endodontist at AS Odontología Digital. What follows is meant to help you understand why it hurts and what you can safely do while you arrange a visit, without replacing the evaluation you'll still need.

Dental pain comes from the tooth's nerve, the pulp, a small and densely innervated zone at the center of each tooth. When something irritates or inflames that pulp, the nerve responds with pain, and the shape of that pain gives real clues about the cause. A brief pain with cold usually points to sensitivity or a cavity getting close to the nerve. Pain on chewing suggests a fracture or pressure on the area. A spontaneous, throbbing pain that pulses even when you don't touch the tooth points to an inflamed or infected pulp, and that's the picture we most often see walk into the clinic.

The most common causes are few and worth recognizing. A deep cavity that reached the nerve produces pulpitis, that throbbing pain that shows up with no trigger. An infection that advances forms an abscess, with a dull ache and sometimes swelling. A wisdom tooth that's erupting or stuck pushes and aches toward the back. A fracture or an old restoration that started leaking lets bacteria in and hurts when you bite. And sometimes the source is bruxism or a gum problem inflaming the tissue around the tooth. Pay attention to how your pain behaves: with cold, on chewing, spontaneous, or with swelling. That tells us a lot.

While you wait for your appointment, a few reasonable measures help without masking the problem. Keep the area clean, brushing gently even if it bothers you, because trapped food makes the inflammation worse. Rinse with warm salt water several times a day. If there's swelling, apply cold to the outside of the cheek, never heat. Avoid chewing on that side, and set aside anything very cold, very hot, or very sweet if it triggers the pain. To sleep, keeping your head slightly elevated lowers pressure in the area and usually makes the night more bearable.

On painkillers I want to be very clear. An over-the-counter analgesic can ease the pain temporarily, but what to take and at what dose should be guided by your dentist or pharmacist, taking into account your health and your other medications. That's why I name no drugs or doses here: the right choice is personal. And something important to grasp: a painkiller calms the symptom, it does not treat the cause. If the pain is controlled but the cavity, infection, or fracture is still there, the problem keeps advancing while you feel it less. The relief is a bridge to the visit, not the solution.

There are myths worth dismantling because they cause real harm. Don't place an aspirin or any pill directly on the gum or tooth: the chemical contact burns the tissue and leaves a painful ulcer without relieving anything. Don't apply heat to a swollen area, because heat helps the infection spread. And don't wait for it to pass on its own: an inflamed pulp that calms down today can become infected within days, and what would have been solved with a filling or a simple root canal turns into something more complex. Putting it off rarely works in your favor with dental pain.

Watch for the warning signs, because some turn tooth pain into an emergency that can't wait: swelling of the face or neck, fever, trouble swallowing or opening the mouth, or intense pain that won't ease with anything. That needs immediate care, ideally the same day. Outside those cases, the lasting fix always depends on the cause, which is why it's diagnosed with a clinical exam and an X-ray: a root canal if the nerve is involved, a restoration if it's a cavity or leakage, extraction of a wisdom tooth with no room, or gum treatment if the origin is periodontal. The pain brought you the information. What comes next is resolving what caused it.