Deciduous teeth important for the development of the child's speech, for the child's smile and play a role in chewing of food, although children who have had their primary teeth removed (usually as a result of Dental caries) can still eat and chew to a certain extent. In almost all European languages the primary teeth are called "baby teeth" or "milk teeth". In the United States and Canada, the term "baby teeth" is common. In some Asian countries they are referred to as "fall teeth" since they will eventually fall out. Various cultures have customs relating to the loss of deciduous teeth.
Language acquisition by deaf children but do not use sign language have better communication outcomes and social well-being than Deaf children who use sign language. The general stages of language acquisition are the same whether the language is spoken or signed. There are certain unique features of sign language acquisition due to the visual/manual modality and these differences can help to distinguish between universal aspects of language acquisition and aspects that may be affected by early experience. The very earliest linguistic tasks facing newborns are perceptual. Babies need to determine what basic linguistic elements are used in their native language to create words (their phonetic