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- Mercury (National Library of Medicine)Mercury is an element that is found in air, water and soil. It has several forms. Metallic mercury is a shiny, silver-white, odorless liquid. If heated, it is ...
- Tooth Decay (National Library of Medicine)What is tooth decay? Tooth decay is damage to a tooth's surface, or enamel. It happens when bacteria in your mouth make acids that attack the enamel. ...
- Tooth Disorders (National Library of Medicine)What are teeth? Your teeth are made of a hard, bonelike material. There are four parts: Enamel, your tooth's hard surface Dentin, the hard yellow part ...