Dra. Cléo Salustiano In this article
SummaryWhy does a tooth hurt after a filling?How long it lasts and what to do while the tooth is sensitiveFAQRead nextTooth Pain After a Filling: Is It Normal and How Long Does It Last?
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Tooth pain after a filling is common, especially after deep cavities or large fillings, and mild sensitivity usually decreases within days or a few weeks. Pain on biting usually means a high filling, solved with a bite adjustment. Spontaneous, throbbing or night-time pain, pain lasting minutes after cold or heat, or pain with swelling needs assessment, as it may indicate pulp inflammation requiring root canal treatment. While the tooth recovers, avoiding temperature extremes and chewing on the other side helps. In Mooca, Dr. Cléo Salustiano (CRO-SP 170844) sees patients every day, from 8 a.m. to 10 p.m.
Feeling some sensitivity or mild soreness after a filling is common and, in most cases, it improves on its own within a few days or a few weeks. It happens mainly when the cavity was deep, close to the tooth's nerve, or when the filling is large. What is not expected is strong pain that appears without a trigger, throbs, wakes you at night or gets worse over the days: in those cases, you need to go back to the dentist.
In clinical practice, one of the most frequent complaints in the days after a filling is "it hurts when I bite". Often the cause is simple: the filling ended up slightly higher than the natural bite, and a quick adjustment at the office solves it. Other times, pain with cold or sweets shows that the tooth is recovering from the decay removal.
Dr. Cléo Salustiano (CRO-SP 170844), a dentist in Mooca, explains why a filling can hurt, how long the discomfort usually lasts, what helps at home and which signs call for an assessment.
This article comes from Dr. Cléo Salustiano's dental office in Mooca, São Paulo (care in English, Portuguese and Spanish). See the general dentistry page to learn how the treatment is done here and book your assessment.
Why does a tooth hurt after a filling?
Removing decay and filling a tooth involves the dentin, the layer under the enamel that has tiny channels connected to the pulp (the "nerve"). The deeper the cavity, the closer to the pulp the dentist has to work and the greater the chance the tooth will be sensitive to cold, sweets or pressure for a while. It is a mild inflammatory response that usually settles.
High filling: if the filling sits above the bite, that tooth takes more force than the others when chewing. The result is pain on biting, which may only appear once the anesthesia wears off. It is one of the simplest causes to fix: the dentist checks the bite with articulating paper and slightly reduces the resin.
Other possible causes: shrinkage of the material as it hardens, which can cause sensitivity in some composite fillings; irritation of the gum around the tooth from the isolation or clamp used during the procedure; soreness at the injection site, which usually passes in a few days; and, in old fillings, leakage underneath the filling.
When pulp inflammation does not settle, it can progress to a point where root canal treatment becomes necessary. The signs are usually spontaneous, throbbing pain, pain that lasts minutes after something cold or hot, pain that wakes you at night or pain with swelling. The article when do you need a root canal describes these signs.
| What you feel | Possible cause | What to do |
|---|---|---|
| Mild sensitivity to cold or sweets that keeps decreasing | Dentin and pulp recovering after decay removal | Monitor; go back if it does not improve |
| Pain on biting or a "high" tooth feeling | Filling above the bite | Go back for a bite adjustment |
| Sore gum around the tooth | Irritation from the procedure or anesthesia | Careful hygiene; usually passes in a few days |
| Pain lasting minutes after cold or hot | Pulp inflammation that may not settle | Assessment by the dentist |
| Spontaneous, throbbing or night-time pain, or swelling | Pulp inflammation or infection | Care as soon as possible |
How long it lasts and what to do while the tooth is sensitive
Mild sensitivity to cold or sweets usually decreases gradually over days or a few weeks. The key point is the trend: if the discomfort is a little smaller each day, the tooth is probably recovering. If it stays the same for a long time or gets worse, go back to the office, even if the pain is bearable.
In the meantime, it may help to avoid very cold or very hot drinks, chew more on the other side for the first days, brush with a soft brush and fluoride toothpaste, and use a toothpaste for sensitive teeth if your dentist recommends it. Pain relievers should only be used as advised by a health professional. Do not put ice directly on the tooth or home remedies on the filling.
Pain on biting that does not improve within a few days calls for a bite adjustment, which is quick and usually brings relief. Spontaneous, throbbing or night-time pain, or pain with swelling, needs to be assessed as soon as possible. For other causes of sensitive teeth, see sensitive teeth: causes and treatment.
This content is for information only and does not replace an exam. Consult a dentist if the pain is not decreasing. In Mooca, Dr. Cléo Salustiano sees patients every day, from 8 a.m. to 10 p.m., including Sundays and holidays, for general dentistry and dental emergencies in Mooca. If the filling is on a front tooth and you also want to change the look of your smile, the composite veneers guide explains the options.
Is it normal for a tooth to hurt after a filling?
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Mild sensitivity is common, especially when the cavity was deep or the filling is large. It usually shows up with cold, sweets or chewing and gradually decreases. Strong, spontaneous pain or pain that gets worse over the days is not expected and should be assessed.
How long does pain after a filling last?
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There is no exact timeframe. Mild sensitivity usually improves in a few days and may take a few weeks to disappear after deep fillings. What matters most is the trend. If the discomfort stays the same or increases, see your dentist.
Why does it hurt when I bite after a filling?
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The most common cause is a filling that is slightly higher than the bite. Because anesthesia numbs the mouth, you may only notice it later. The dentist checks the bite and makes a small adjustment, which usually relieves the pain.
Can a painful filled tooth need a root canal?
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In some cases, yes. When the decay was very close to the pulp, the inflammation may not settle. Warning signs are spontaneous, throbbing pain, pain that wakes you at night, pain lasting minutes after cold or hot, or swelling. Only a clinical and X-ray exam can confirm whether a root canal is needed.
An old filling started to hurt. What could it be?
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It could be leakage under the filling, new decay at the edge, a crack in the tooth or wear of the filling. It may also be unrelated, such as gum recession. It is worth booking an assessment; the article on when to replace an old filling helps explain the signs.
Can I take medication for pain after a filling?
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Pain relievers and anti-inflammatories should only be used as advised by a health professional, who considers your health and other medications. Medication can mask pain without solving the cause, so if you need it often, that is a sign to go back to the dentist.
Where can I have pain after a filling checked in Mooca?
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In Mooca, Dr. Cléo Salustiano (CRO-SP 170844) sees patients at Rua Hipódromo, 1141, near Bresser-Mooca station, Monday to Sunday, from 8 a.m. to 10 p.m., including holidays. Appointments via WhatsApp (11) 97409-7834, in Portuguese, English or Spanish.
