In a person, the lower jaw protrudes out causing unability of person to speak. Name the disease. How is it caused?

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Solution

Prognathism is a positional relationship of the mandible or maxilla to the skeletal base where either of the jaws protrudes and causes inability to speak. An extended (protruding) jaw can be part of a person's normal face shape that is present at birth. It can also be caused by inherited conditions, such as Crouzon syndrome or basal cell nevus syndrome.

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