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Deciduous teeth are the child's and other mammal cubs' first set of teeth. Through childhood they fall out and are replaced by the permanent adult teeth. Humans generally has 20 deciduous teeth and 32 permanent teeth. They have many different functions and is used among other things to chew and bite with. Moreover, they have major impact on health, appearance, speech and song. The enamel on the tooth crown is the body's hardest substance.