Quick answer: Wisdom tooth pain is usually caused by the tooth being stuck, called impacted, or by infection in the gum around it. Warm salt water rinses and pain relief can ease it for a short time, but they do not fix the cause. A wisdom tooth needs removal when it is impacted, repeatedly infected, decayed, or damaging the tooth next to it. Not every wisdom tooth has to come out.

Wisdom teeth are the last to arrive, usually in the late teens or early twenties, and they often cause trouble simply because there is no room left for them. If you have a dull ache or a sharp pain at the very back of your jaw, a wisdom tooth is a likely culprit. The honest news is that tooth pain from a wisdom tooth is common, often manageable, and not always a reason for removal, but it should always be checked.

What causes wisdom tooth pain?

There are a few common causes, and they often overlap. The most frequent is impaction, where the tooth cannot fully come through because there is not enough space, so it pushes against the gum or the neighbouring tooth. Another is infection of the gum flap over a partly erupted tooth, where food and bacteria get trapped and cause swelling, called pericoronitis. A wisdom tooth can also decay easily because it is hard to clean at the back, and a deep cavity there causes the same throbbing pain as in any tooth.

• Impaction, where the tooth is stuck and cannot fully come through.
• Infection of the gum flap over a partly erupted tooth.
• Decay, because back teeth are hard to clean.
• Pressure on the tooth in front as the wisdom tooth pushes against it.

What does wisdom tooth pain feel like?

The pain can range from a mild, on and off ache at the back of the jaw to a constant throb with swelling. You might feel tenderness when biting, notice the gum at the very back is red or swollen, find it hard to open wide, or get a bad taste from trapped food and infection. Pain that spreads to the ear or jaw on one side is common. If there is swelling of the face, fever, or difficulty swallowing, that is a sign of a spreading infection and needs urgent dental care, not a wait and see approach.

What helps wisdom tooth pain for now?

While you arrange to see a dentist, a few safe steps can ease the pain. Rinse gently with warm salt water several times a day to clean the area and reduce swelling. Keep the area as clean as you can, brushing carefully even though it is tender. Over the counter pain relief taken as directed on the label helps, and a cold compress on the cheek can reduce swelling. These give relief, but be honest with yourself, they do not cure the cause, and a trapped or infected wisdom tooth will keep flaring until it is properly treated.

Important: Do not place a tablet directly on the gum, as it can burn the tissue. If your face swells, you get a fever, or you cannot open your mouth or swallow properly, seek dental care urgently, as a wisdom tooth infection can spread.

Can you prevent wisdom tooth problems?

Some wisdom tooth trouble can be eased or delayed with good habits, even if you cannot change whether the tooth is impacted. Because the back of the mouth is so hard to reach, careful cleaning there is the single most useful thing you can do, since most wisdom tooth pain that is not from impaction comes from trapped food and the decay or gum infection it causes. Regular professional cleaning keeps the area healthy and lets a dentist spot a problem early, and routine dental visits with an occasional X ray show whether a wisdom tooth is coming through cleanly or heading for trouble. Rinsing with warm salt water when the gum feels tender can settle a minor flare before it grows. None of this guarantees a trouble free wisdom tooth, since a truly impacted one will still need attention, but it does reduce the infections and decay that cause much of the pain. Catching a problem early also means a simpler decision later, rather than an emergency.

When does a wisdom tooth need to be removed?

Not every wisdom tooth must come out, and an honest dentist will not remove one that is healthy and causing no trouble. Removal is usually recommended when the tooth is impacted and painful, when it keeps getting infected, when it is badly decayed and cannot be saved, or when it is damaging or pushing the tooth next to it. A wisdom tooth that has come through fully, is clean and bites normally can often simply be left alone and looked after like any other tooth. The decision should be based on an examination and usually an X ray, not on fear.

Looking after the area after removal

If a wisdom tooth is removed, the few days of aftercare make a big difference to how smoothly you heal, so it is worth knowing in advance. For the first day it is normal to have some bleeding, swelling and soreness, and biting gently on the gauze pad helps the area settle. Cold compresses on the cheek reduce swelling, and rest rather than heavy activity helps in the first day or two. It is important not to rinse forcefully, smoke, or use a straw early on, because the suction can dislodge the healing clot and cause a painful problem called a dry socket. Soft, cool foods are easiest at first, and you can return to normal eating as comfort allows. Keeping the rest of the mouth clean, while being gentle around the site, prevents infection. Most people feel much better within a few days. Following the specific aftercare your dentist gives you is the single best way to avoid complications, and it turns what sounds daunting into a routine recovery that is over before you know it.

What to expect if it is removed

If removal is needed, it is a routine procedure done under local anaesthetic, so you should feel pressure but not pain during it. Simple cases are quick, while a deeply impacted tooth takes a little more work. Afterwards you can expect some swelling and soreness for a few days, which is managed with rest, cold compresses and the aftercare your dentist gives you. If you have pain at the back of your jaw, the sensible step is to get it assessed rather than to keep treating it with painkillers. You can book an appointment to find out exactly what is going on and whether removal is even necessary.

Medical disclaimer: This article is for general information only and is not a substitute for professional dental advice, diagnosis or treatment. Every mouth is different, so please see a qualified dentist for advice on your own situation.

Frequently Asked Questions

Why does my wisdom tooth hurt?

Usually because it is impacted, or because the gum around it is infected, or it has decayed. All are common and should be checked by a dentist.

How can I relieve wisdom tooth pain at home?

Rinse with warm salt water, keep the area clean, use a cold compress, and take pain relief as directed. This eases it but does not fix the cause.

Does every wisdom tooth need to be removed?

No. A healthy wisdom tooth that comes through fully and causes no trouble can be kept. Removal is for impacted, infected, decayed or damaging teeth.

Is wisdom tooth removal painful?

The procedure is done under local anaesthetic, so you feel pressure but not pain. Some swelling and soreness for a few days afterwards is normal.

When is wisdom tooth pain an emergency?

If you have facial swelling, a fever, or trouble opening your mouth or swallowing, seek dental care urgently, as the infection may be spreading.