Disorders of the Teeth Cavities and tooth decay. The most common ways to treat cavities and more serious tooth decay problems are: The bacteria digest the carbohydrates in the food and produce acid, which dissolves the tooth's enamel and causes a cavity. This process is called eruption or teething. The lips that line the outside of the mouth both help hold food in while we chew and pronounce words when we talk. To avoid tooth decay and cavities, do not give your child a bottle when going to sleep. The lips are covered with skin on the outside and with slippery mucous membranes on the inside of the mouth. Human teeth are made up of four different types of tissue: A bundle of muscles extends from the floor of the mouth to form the tongue. The molars' purpose is to grind food, and the incisors and canine teeth are used to bite into and tear food. Although their cause isn't completely understood, mouth injuries, stress, dietary deficiencies, hormonal changes such as the menstrual cycle , or food allergies can trigger them.
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