Toothache: Causes, Relief, and When to See a Dentist

What actually causes a toothache

Pain in a tooth almost always comes back to one thing: the nerve inside it (the pulp) is irritated, inflamed, or dying. What irritates it decides the fix, so it is worth knowing the usual suspects.

• Decay that has reached the nerve. A cavity that started small keeps working inward until it reaches the pulp. This is the most common reason a tooth starts to ache.
• A crack or a broken tooth. A cracked tooth can hurt sharply when you bite and then let go, and it may come and go for weeks before anything shows.
• An infection or abscess at the root. A dead nerve builds a pocket of pus at the tip of the root. This is the pain that throbs, keeps you up, and does not ease when you change position.
• A lost or failing filling or crown. When a filling or a crown comes loose or falls out, the sensitive layer underneath is suddenly exposed.
• A receding gum and an exposed root. Roots have no enamel to protect them, so a bare root can be sharply sensitive to cold or sweet.
• Pressure from a wisdom tooth. A wisdom tooth pushing in at an angle aches at the back of the jaw and can inflame the gum over it.
• Pain that is not the tooth at all. A sinus infection presses on the roots of the upper back teeth and can feel exactly like a toothache in several teeth at once.

How to ease a toothache tonight

None of this treats the cause, so think of it as taking the edge off until you can be seen, not a fix.

• An anti-inflammatory painkiller. Ibuprofen, taken with food and following the packet, works better on tooth pain than paracetamol alone, because most toothache is inflammation. Which painkillers actually help a toothache covers doses and safe combinations.
• Warm salt-water rinses. Half a teaspoon of salt in a glass of warm water, swished gently, cleans the area and calms the gum.
• Keep your head propped up. Lying flat sends more blood to your head and makes a toothache throb harder, which is why it always feels worse at night. Our guides to sleeping with a toothache and why it gets worse after dark go further.
• Cold on the cheek, not heat. An ice pack wrapped in a thin towel eases the ache. Heat over a possible infection can make swelling worse.
• Leave the aspirin in the packet. Swallow painkillers; never hold one against the tooth or gum. An aspirin tablet pressed on the gum burns the tissue and does nothing for the tooth.

For more on holding things steady until an appointment, see how to stop tooth pain until you can be seen.

What the kind of pain is telling you

The pattern of a toothache is a rough clue to what is going on, though it is never a diagnosis on its own.

• Sharp pain only when you bite down. Often a crack or a high filling, especially if it eases the moment you let go.
• A quick zing to cold or sweet that fades in seconds. Usually sensitivity or early decay, not yet an emergency. Lingering pain to heat, on the other hand, points to the nerve being in trouble.
• An ache that comes and goes over days or weeks. A nerve that is inflamed but not yet dead. It tends to get worse, not better, if left.
• Constant, deep throbbing that keeps you awake. More like a dying nerve or an abscess, and the kind worth being seen for quickly.

When a toothache is an emergency, and when it can wait

Most toothaches are a same-day or next-few-days dental visit, not a crisis. A plain ache, brief sensitivity, or a chipped edge with no swelling can usually wait a day or two for an appointment. Some cannot.

Be seen the same day if you have swelling in the face or gum, a fever alongside the tooth pain, a bad taste from a gum boil that keeps returning, or pain that no painkiller touches. Those point to an abscess, and facial swelling from a tooth is the sign it has spread beyond the tooth.

Go straight to a hospital emergency room, not a dentist, if swelling is spreading toward your eye or down your neck, you have trouble breathing or swallowing, you cannot open your mouth more than a finger's width, or you have a high fever with chills and feel genuinely unwell. A dental chair is not built for an infection that has reached those spaces. We set out exactly where that line sits in when a toothache is a dental emergency.

Why a toothache will not fix itself

A toothache can fade on its own, and that is the trap. When the pain from a deep problem suddenly stops, it usually means the nerve has finished dying, not that the tooth has healed. The cause is still there. Waiting to see whether it settles is usually the more expensive choice, because a problem caught early is a filling, and the same problem left is a root canal or an extraction.

What the fix is depends on the cause. Early decay is a filling. A nerve that has become infected is cleaned out with a root canal, which keeps your own tooth. An abscess is drained and the tooth treated. Only a tooth too far gone to rebuild has to come out. Leaving an infected nerve alone does not make it go away; what happens if you skip the root canal spells out where that road leads.

The short version: a toothache is your tooth flagging a real problem, you can take the edge off tonight with an anti-inflammatory, a salt rinse, and your head propped up, but the ache stops for good only when the cause is treated. Sensitivity and a mild ache can wait a day or two. Swelling, fever, or pain nothing touches should be seen the same day.

We treat tooth pain, infections, and abscesses at our emergency dental clinic in Beit Shemesh, at Harav Kook 28/1. Call or WhatsApp 055-985-8845, Sunday to Thursday 8:00 AM to 8:00 PM and Friday 8:00 AM to 2:00 PM, with after-hours emergency treatment outside those hours. You can send a photo or a recent X-ray before you come in. If any of the emergency signs above apply, though, do not message first: go straight to a hospital emergency room.

For guidance from sources with nothing to sell, the ADA's MouthHealthy runs through the most common dental symptoms and what they mean and which ones count as a dental emergency, and the American Association of Endodontists explains what different kinds of tooth pain point to.