Generally there are two causes of protruding dental bed, the details are as follows: 1, congenital factors: such as genetic factors, parents with protruding front teeth or jaws, children may also have protruding front teeth. In addition, abnormal embryonic development, maternal environment abnormalities, such as malnutrition, endocrine disorders, injury, infection or certain drugs can lead to a protruding tooth bed; 2, acquired factors: related to bad habits during growth and development, such as long-term open-mouth breathing leading to anterior teeth protrusion, jaw recession, sucking fingers and other habits can also lead to protruding front teeth. If children suffer from rhinitis or adenoid hypertrophy, which leads to nasal congestion and inability to breathe normally, it may also lead to protruding teeth. Adults who suffer from aggressive periodontitis can also lead to protruding front teeth.