Why does one tooth feel sensitive when biting down?

A tooth that feels sore when biting may be caused by tooth hypersensitivity, apical periodontitis, deep caries, or other reasons.

1. Tooth hypersensitivity

This may be due to dentin hypersensitivity, which causes a sour or sensitive sensation when consuming cold, hot, sour, or sweet foods, often resulting from severe tooth wear. Brushing with a desensitizing toothpaste such as Lengsailing may help. Chewing ginger slices or tea leaves may also provide relief. If symptoms persist, visit a dental clinic for desensitization treatment.

2. Apical periodontitis

This condition is primarily caused by bacterial infection within the pulp chamber spreading to the surrounding tissues at the root tip, leading to inflammatory reactions. Chewing may cause tooth soreness or discomfort. Under medical guidance, antibiotics such as cloxacillin capsules or amoxicillin capsules can be taken, along with analgesics like pain-relieving tablets to alleviate discomfort.

3. Deep caries

If the decayed cavity is deep and close to the pulp chamber, food components may enter the cavity during eating, stimulating the underlying dental pulp and causing soreness or pain. It is recommended to undergo a base filling treatment.

In addition, similar symptoms may also result from dental caries or vertical root fractures. Maintaining good oral hygiene in daily life is important. Avoid consuming very hot or cold foods to prevent discomfort caused by thermal stimulation.