### Why Teeth Feel Sensitive After a Filling and How Long It Lasts Teeth sensitivity is common after getting a filling. Here are some reasons why this happens and what you can do about it. #### What is a Dental Filling? A dental filling is a treatment for cavities, which are small holes in your teeth caused by decay. During the procedure, your dentist fills these holes with materials like amalgam or composite. While this is a routine procedure, it often leaves people with sensitive teeth afterward. #### Causes of Sensitivity 1. **Heat from Drilling**: The drill used to remove the decayed part of your tooth releases heat, which can inflame the pulp (the connective tissue inside your teeth). This can cause a condition called pulpitis. 2. **Incomplete Decay Removal**: If all the decaying tissue isn't removed, it can lead to an infection in the pulp, causing swelling or pus near the tooth. 3. **Bite Issues**: Sometimes the filling can make the affected tooth taller than others, causing pain when you close your mouth. This can even crack the filling. 4. **Different Materials**: Having different materials in your mouth, like a gold crown and a silver filling, can cause odd sensations when they touch. 5. **Referred Pain**: Pain can also be felt in surrounding teeth due to a phenomenon called referred pain. 6. **Allergic Reactions**: Sensitivity might also be an allergic reaction to the filling material, accompanied by a rash or itching. #### How to Reduce Sensitivity - Avoid hot and cold foods and drinks. - Chew on the other side of your mouth. - Brush your teeth gently. - Contact your dentist if you think there's a problem with your bite. #### When to See a Dentist Sensitivity usually goes away within two to four weeks. If it doesn't improve or lasts longer than four weeks, contact your dentist. You might need further treatment like a root canal if the sensitivity is due to pulpitis. By understanding these causes and taking appropriate steps, you can manage and reduce tooth sensitivity after a filling.