The most common cause of toothache is decay (also known as a "cavity") due to dental plaque (made up of the bacteria, acids, and sugars in your mouth) which corrodes the protective enamel on your teeth.
If tooth decay is not addressed, an abscess can develop in the gum and in the most extreme circumstances may eventually lead to blood poisoning.
Other causes of toothache include:
- Impacted teeth (especially wisdom teeth)
- Gum disease
- Your dentist is the most appropriate person to talk to regarding toothache.
If the toothache is caused by decay, your dentist will normally repair the tooth with a filling. In extreme cases, you may need either root canal therapy or a tooth extraction.