The primary cause of toothaches is when the bacteria that live in your mouth generate a plaque that sticks to teeth. The acids from the bacteria eat through the enamel of teeth until the more delicate core of the tooth is affected. Other causes may involve new teeth erupting from the gums (for children or adolescents), build up food debris between teeth or lodged between a tooth and its gum line, or a fracture in a tooth. Here are some home remedies that can help relieve these symptoms.