The primary cause of tooth sensitivity is worn tooth enamel (outer layer protecting the teeth) or root exposure due to gum recession, which exposes dentin, the teeth’s underlying layer.

While fillings are a safe, simple, and effective way to treat a cavity, it is not unusual or uncommon to experience pain, discomfort, and sensitivity in and around the area of the filled tooth for a few days or several weeks after the anesthesia wears off.