Tooth pain after a filling — sensitivity, throbbing and when it means root canal

Key facts

• Mild cold sensitivity often settles over days to weeks
• Pain on biting is often a high filling that is easy to adjust
• Lingering, throbbing or night pain needs examination
• Deep fillings close to the nerve carry more risk of pulpitis
• Facial swelling or fever needs urgent care

Normal sensitivity after a filling

After decay is removed and a filling placed, the nerve inside the tooth can be irritated for a while. This often shows as short twinges to cold drinks, cold air or sweet foods, and sometimes mild tenderness when biting. It is usually more noticeable after larger or deeper fillings and on back teeth. In most cases the sensitivity steadily improves over days to a few weeks as the nerve settles. Using a toothpaste for sensitive teeth, avoiding very cold foods and chewing gently on the other side can help. The key sign of normal healing is that the discomfort is brief, triggered by something, and getting better rather than worse.

A high bite: pain when chewing

If the filling is slightly too high, the tooth hits first when you close and takes extra force with every bite. This commonly causes sharp pain on biting, a feeling that the tooth is “bruised”, or soreness of the jaw. Because the tooth was numb during treatment, a high spot may not be noticed until the anaesthetic wears off. A high bite does not usually improve by itself and can inflame the ligament around the tooth. The fix is simple: the dentist checks your bite with marking paper and smooths the high point, often giving relief within a day or so.

Throbbing after a deep filling close to the nerve

When decay reaches close to the pulp, the dentist may place a protective lining before the filling and warn you that the tooth might react. Lingering pain to cold that lasts more than a few seconds after the trigger is removed, spontaneous aching, throbbing, pain that wakes you at night, or pain on lying down suggest the nerve is inflamed in a way that may not recover, called irreversible pulpitis. Pulsing pain in the tooth after a filling is a common search, and it deserves an examination rather than waiting. An X-ray and tests of how the tooth responds help the dentist decide the next step.

When pain means root canal treatment

If the nerve cannot recover, root canal treatment removes the inflamed or infected pulp, cleans and seals the canals and relieves the pain, while keeping the tooth. Signs that point towards this include constant or night pain, pain that lasts long after hot or cold, swelling of the gum or face, a bad taste or a small gum bump. These do not mean the filling was done badly; deep decay can damage the nerve before the filling is placed. Facial swelling, fever or difficulty swallowing need urgent care. Your dentist will explain the options, including root canal treatment or, if the tooth cannot be saved, extraction.

Pain after a filling — assessment in Dubai at Manhal

At Manhal Medical Center in Dubai, Dr. Fariba Alnoory, a general dentist with more than 14 years of experience, assesses pain after a filling by checking your bite, testing the tooth’s response to cold and taking an X-ray when needed. She adjusts high fillings, recommends desensitising care for ordinary sensitivity and explains clearly if root canal treatment is likely to be needed, coordinating it if so. Anxious patients are welcome to discuss concerns first. The clinic is open daily, and consultations are in English and Arabic.

Composite fillings repair cavities with resin matched to your tooth colour. They bond to the tooth, allowing a more conservative preparation than old metal fillings.

Prepared by the Manhal Medical Center editorial team · Updated: 2026-10-18 · Treating specialist: Dr. Fariba Alnoory

This page is general information and does not replace a consultation. Suitability, risks and results vary between patients.