Gentle Touch Dentistry comprises an expert team of dentists, who have been serving the residents of Fullerton for years. In dentistry, the most common dental problem is toothache. A toothache in Fullerton or pain around your tooth can be caused by a number of reasons. The most basic reason for a () toothache in Fullerton is tooth decay. Tooth decay can cause cavities, which can cause a lot of damage to enamel and dentin.