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Teeth and Microbes, , A child gets first tooth when he/she is six, or seven months old. At the age of three a, child has usually 20 teeth. The first set of, teeth is called milk teeth or temporary, teeth. When the child is about six years, old, the milk teeth or temporary teeth, begins to fall out. New teeth begins to, grow in place of milk teeth. These new, teeth are called permanent teeth. An, adult human being has 32 permanent, teeth.