The pain may be severe enough to affect the quality of sleep.
Severe, sharp, and nerve-like pain in the mouth, which can radiate into the ear and face.
Often toothache is caused by a problem within the nerve of a tooth, which is usually a result of severe dental decay or a crack that has extended deep enough to penetrate into the nerve.
The tooth can become infected. The infection can continue to spread, causing the face the get swollen.
In very severe cases, the swelling can be big enough to affect other areas, such as the throat. This can be dangerous and potentially result in hospitalisation.