Covering Tooth is a term used to describe the protective layer of the teeth. ENAMEL, which is a six-letter word, is the hard, outermost layer of the tooth that protects it from decay and damage. MOLAR, a five-letter word, is a type of tooth located in the back of the mouth that is used for grinding food. ACHE, a four-letter word, is a feeling of pain or discomfort in the teeth. Finally, FANG, a four-letter word, is a sharp, pointed tooth found in some animals, such as wolves and snakes. Together, these words describe the protective covering of the tooth and the different types of teeth that make up the mouth.