Why does toothache occur and what causes it? Dental pain can occur for a variety of reasons, and the causes of dental pain can vary depending on the individual. Some common causes of dental pain include: Tooth decay: When bacteria in the mouth produce acids that erode the enamel of the tooth, it can lead to a cavity or tooth decay, which can cause dental pain. Gum disease: Ging... https://www.emergencydentistsydneycity.com.au/toothache/