A toothache can be caused by anything from a popcorn hull stuck in your gum to a broken tooth or a bacterial infection. Some toothaches may come from temporary gum irritation. But serious toothaches need treatment by a dental professional to resolve the pain and whatever problem is causing it.

Why is my toothache so painful?

The pulp inside your tooth is soft material filled with nerves, tissues and blood vessels. These pulp nerves are among the most sensitive in your body. When these nerves are irritated or infected by bacteria (abscess), they can cause severe pain.
What are possible causes of toothache?

Toothaches can be caused by:

Tooth decay.

Abscessed tooth (a bacterial infection inside the center of the tooth).

Tooth fracture (broken tooth).

A damaged filling.

Repetitive motions, such as chewing gum or grinding or clenching teeth. These motions can wear down your teeth.

Infected gums.

Eruption (teeth coming out of the gums) or removal of a tooth (for example, wisdom teeth).