In the clinic, we often encounter such children, whose parents are very anxious because of the particular aesthetic impact. The first thing you need to do in this case is to carefully examine the child’s oral condition and find out the cause. The examination will often reveal that the child will have some bad oral habits, such as mouth breathing, biting the lower lip, and so on. When we breathe normally, air is naturally inhaled through the nasal cavity, with the upper and lower lips slightly closed and the tongue located on the palate. The muscle strength inside and outside the mouth is balanced, and the oral and maxillofacial development is coordinated and normal. When children have nasal diseases such as colds, chronic rhinitis, allergic rhinitis, adenoid hypertrophy and other diseases, the respiratory tract is partially or completely blocked, the child will switch to open-mouth breathing, and over time the habit of mouth breathing is developed. Some babies have recovered from colds or rhinitis, the nasal cavity has been open, but still used to mouth breathing. When mouth breathing, mouth and lips open, the muscle strength inside and outside the mouth lose balance, will lead to dental and jaw and facial deformities, excessive front teeth protrusion, narrow dental arch, high arch palate, crowded teeth, jaw retraction, lip fat, seriously affect the facial beauty and oral function. In addition, mouth breathing will also affect sleep, especially when adenoid hypertrophy, may also appear sleep apnea, affecting the child’s general development, children are prone to inattention, memory loss and other symptoms. Treatment: 1, first to the ear, nose and throat examination, such as rhinitis, adenoid hypertrophy or tonsil hypertrophy, to timely treatment or surgery to remove. 2, break bad habits and stop the development of deformities, there are a variety of orthotics to improve muscle function, which can help children correct bad habits of mouth breathing and improve jaw and dental arch development. This child is 8 years old and has been wearing the myofunctional braces for 10 months. The alignment, bite and facial shape of the teeth have improved significantly. Before treatment After treatment.