Jaw Pain After Dental Work: Causes and How Long It Lasts

Editorially reviewed by the Dental.me Editorial Team · Updated November 2026

Editorially reviewed by the Dental.me Editorial Team · Updated November 2026

Jaw pain after dental work is usually muscle or joint strain from holding your mouth open, or soreness where the numbing injection went in, and it normally eases within days to about two weeks. After an extraction, a stiff jaw can take longer, with one NHS leaflet giving two to four weeks.

A jaw that is getting harder to open instead of easier, swelling, a fever or a bite that feels off are reasons to call your dentist. Trouble breathing or swallowing needs emergency care.

Holding your mouth open can strain the jaw muscles and joint

The most common reason for a sore jaw after an appointment is simply keeping your mouth wide open for a long time. The American Association of Endodontists says some mild jaw soreness is expected after a root canal for exactly this reason. A patient handout on jaw joint disorders lists dental procedures that required prolonged mouth opening among the causes of jaw pain and stiffness.

Longer visits seem to carry more risk. In a study of 80 people whose root canal treatment lasted more than two hours, the authors found that the long sessions could bring on signs of jaw joint disorder, and pain near the ear increased one week later. People treated on back teeth had more pain than those treated on front teeth. That study looked only at very long appointments, so it does not tell you how often a routine cleaning or filling causes the same thing.

The numbing injection can make it hard to open your mouth

The injection that numbs your lower teeth can leave the jaw sore and stiff. Doctors call restricted opening trismus: a painful condition in which a muscle contracts or goes into spasm so you cannot open your mouth normally.

For the lower teeth, the needle passes close to a chewing muscle called the medial pterygoid, and it can accidentally go into that muscle. One case report describes a patient who developed this kind of spasm the day after three lower-jaw injections for a routine filling, with no swelling or fever. Treatment in that report was heat, gentle stretching, pain relievers or muscle relaxants, and physical therapy.

Two other causes are less common:

• A bruise (hematoma). If the needle nicks a blood vessel, blood can collect in the tissue. A dental hygiene journal says this can follow lower-jaw injections and that you may have soreness and limited opening. It says bruising normally heals in 7 to 14 days without further treatment.
• Infection along the needle track. A 2024 case report says trismus that starts two to three days after the injection, rather than within hours, is most likely caused by an infection. That needs to be seen.

Sources differ on how long injection-related trismus lasts. The same 2024 report says it typically resolves in about six weeks, with a range of four to 20 weeks, and its own patient took 50 days to recover. Reports on stiffness after wisdom tooth removal give a much shorter one to two weeks, so expect a wide range. If you are not sure whether what you feel is stiffness or lingering numbness, our guide to numbness after dental work explains the difference.

A filling or crown that sits high can make your jaw ache

If your teeth do not meet the way they used to, your jaw muscles may work harder and get sore. Cleveland Clinic says pain can occur if a new filling interferes with your bite, and that a dentist can usually adjust the shape of the filling to fix it.

The problem is easy to miss at the visit, because you cannot judge your bite well while you are numb. The American Association of Endodontists lists a bite that feels uneven as a reason to contact the office after a root canal, and an NHS page on jaw joint problems names an uneven bite as one cause of jaw pain. Read more about a bite that feels off after a filling.

Existing jaw joint problems can flare after a visit

If you already have clicking, jaw pain or a clenching habit, a long appointment can set it off. An NHS page says jaw joint problems are not usually serious and generally get better on their own, and Cleveland Clinic says some people feel better in a week or two.

One practical step for next time comes from the same patient handout: tell your dentist you have jaw joint problems, ask for short breaks to close your mouth, and ask about a bite block, a small prop that holds your mouth open with less muscle effort. For a broader look at jaw pain that is not linked to an appointment, see our guide to common causes of jaw pain.

After an extraction, a stiff jaw is expected for a week or more

Stiffness after a tooth is removed, especially a lower wisdom tooth, is normal. The NHS says your jaw may be sore and stiff for up to two weeks after wisdom tooth removal. An NHS Lothian leaflet says the facial muscles can be stretched during surgery and that jaw stiffness normally settles within two to four weeks.

The worst day is usually not the first. In a study of 31 people who had a lower wisdom tooth removed, swelling peaked at 72 hours and mouth opening was most limited at the same point, then returned to normal within the week. Pain, by contrast, eased steadily from the start. A journal review of persistent trismus after wisdom tooth removal says it usually resolves in one to two weeks and lasts more than a month only in very rare cases.

What should not happen is a jaw that gets worse after the first few days. Guy’s and St Thomas’ NHS trust says that with an infection, pain and swelling usually get worse about four to six days after surgery. Increasing pain with a bad taste and bad breath can also point to dry socket.

How to ease a sore jaw at home

These steps come from NHS, MedlinePlus and dental aftercare guidance:

• Eat soft food. The NHS suggests foods like pasta, omelettes and soup, and MedlinePlus recommends a soft diet to calm the joint.
• Use cold or heat, depending on the cause. After an extraction, cold comes first: Cleveland Clinic advises a wrapped ice pack, 20 minutes on and 20 minutes off. For muscle stiffness from an injection, a dental hygiene journal suggests ice at first and moist warmth from the next day, and a 2024 case report used moist hot towels for 15 to 20 minutes every hour. For a jaw joint flare, the NHS and MedlinePlus say either heat or cold is fine. If you have had surgery, ask your dentist before using heat.
• Take an over-the-counter pain reliever. MedlinePlus lists short-term acetaminophen, ibuprofen or naproxen. Follow the label. Cleveland Clinic advises avoiding aspirin after wisdom tooth removal because it can make the site keep bleeding.
• Rest the jaw. The NHS says not to chew gum or yawn too wide.
• Stretch gently once the worst has passed. MedlinePlus suggests learning to gently stretch, relax or massage the jaw muscles. The trismus case reports used gentle opening exercises too.

When to call your dentist

Call if your jaw is getting harder to open, if pain is getting worse rather than better after a few days, or if your bite feels wrong. If you do not have a regular office, you can find a dentist near you. If the problem started after an extraction or wisdom tooth surgery, you can also find an oral surgeon near you.

What’s usually normal:

• Mild jaw soreness from holding your mouth open that eases over a few days
• Mild stiffness from the injection that is slowly improving
• After an extraction, stiffness that is worst around day 3 and then gets better

Call your dentist soon:

• Opening is getting more limited, or stiffness started two to three days after the injection
• Your bite feels uneven or high
• Severe pain or pressure lasting more than a few days, or pain that medicine does not help
• Visible swelling inside or outside your mouth, a swollen face or jaw, or a fever
• Pain and swelling that get worse after the third day following surgery
• Trouble eating or opening your mouth enough to eat

Red flags: call 911 or go to the ER

Trouble breathing or swallowing is always an emergency. The NHS says to call emergency services or go to the emergency department if you:

• Find it hard to breathe, speak or swallow
• Have a lot of swelling in your mouth
• Find it hard to open your mouth, along with signs of a dental infection
• Have a swollen or painful eye, or sudden problems with your eyesight

A jaw that will not open at all is covered in our guide to locked jaw and when it is an emergency.

Frequently asked questions

Is it normal for your jaw to hurt after a filling?

Yes, mild soreness is common, usually from holding your mouth open or from the numbing injection, and it should ease over a few days. If your teeth do not meet the way they used to, the filling may be sitting high. Cleveland Clinic says a dentist can usually adjust it.

How long does jaw pain last after dental work?

Soreness from holding your mouth open usually eases within a few days to about two weeks. After a wisdom tooth removal, the NHS says the jaw may be stiff for up to two weeks, and one NHS leaflet gives two to four weeks. The less common muscle spasm from the injection can take longer: one 2024 case report says it typically resolves in about six weeks, and it can last longer.

Why can’t I open my mouth all the way after the dentist?

This is called trismus. It is often a muscle spasm after the lower-jaw numbing injection or stiffness after an extraction. Call your dentist if opening is getting worse, or if it started two to three days after the injection, because that pattern can mean infection.

Should I use ice or heat for jaw pain after the dentist?

After an extraction, use a wrapped cold pack first and ask before using heat. For muscle stiffness from an injection, sources suggest cold at first and moist warmth from the next day. For a jaw joint flare, the NHS and MedlinePlus say either heat or cold can help.

Can a high filling cause jaw pain?

Yes. A filling or crown that interferes with your bite can make the jaw muscles work harder and ache. The fix is usually a quick adjustment of the filling’s shape, so call your dentist rather than waiting.

When is jaw pain after dental work an emergency?

Go to the ER or call 911 if you have trouble breathing, speaking or swallowing, a lot of swelling in your mouth, or swelling around your eye. A fever with facial swelling, or a jaw that is getting harder to open, means you should call your dentist right away.