Having sensitive teeth can have several implications. You may have:
Tooth decay
A cavity, which is a hole in your tooth
Old fillings that are hiding tooth decay
Worn-out enamel, which is the hard, protective layer covering your teeth
An exposed tooth root, which is often very painful
A loose tooth
Gum disease
Receding gums
Your dentist can fix your tooth sensitivity problem, but only after a thorough checkup to find out the exact cause. You may even have several teeth that are collectively causing your tooth sensitivity. Your dentist may recommend several options, including a root canal, the extraction of a tooth, protective crowns or redoing old fillings to help resolve the issue. You may even get advice on the type of foods that could be causing your teeth sensitivity, so that you can limit or avoid eating those foods.