Harmful to children’s habitual small actions are called children’s oral bad habits, long-term persistent oral bad habits can affect the jawbone development, resulting in misalignment of teeth or even dental and maxillofacial deformities. In life, we often see children grow uglier and uglier, and many of them are caused by bad habits that lead to dental and maxillofacial development incongruity. Therefore, parents should correct their children’s bad habits as soon as possible, if necessary, take the child to a regular hospital, the dentist can use a variety of bad habits to help the child overcome bad habits, to avoid the occurrence of dental misalignment and jaw development deformities. Those who have already shown malocclusion need orthodontic treatment. Common bad oral habits include: Tongue licking: The most common problem that occurs during tooth replacement is that children often use their tongue to lick loose baby teeth or new permanent teeth, thus forming the bad habit of sticking out the tongue or tongue. The tongue often forms a partial opening between the upper and lower teeth (meaning that the upper and lower teeth don’t touch each other), and gaps appear between the teeth. Lip biting: Biting the upper lip frequently may cause the front teeth to backbite and the jaw to protrude forward. Biting the lower lip will cause the upper front teeth to protrude and the lower jaw to retract, and the upper lip will become thick and short, showing an open state with exposed teeth. Side chewing: children often due to dental caries and other reasons in the emergence of side chewing habits, which will cause the development of the left and right side of the face of the asymmetry, and not often chewing side because of the lack of food flushing more likely to build up tartar, dental caries and other periodontal diseases. Biting things: many children like to gnaw finger nails or bite the corner of the coat, cuffs, corner of the quilt, pillow corner and sucking the pacifier, etc., because when biting these objects are generally always fixed in a certain part of the teeth, and thus easy to form a small localized opening and closing deformity of the teeth. Unhealthy sleeping habits: some children are used to sleep with their elbows, palms, fists, etc. under one side of the face, or like to hold one side of the cheeks with their hands, which have an impact on the normal development of the child’s jaw and face and the symmetry of the face. Picking teeth: If children form the habit of picking teeth, the gap between the teeth will slowly become wider, and food is easy to embedded in the gap. In addition, if the toothpick is not hygienic, the mucous membrane of the gums will be broken when flossing and bacteria will enter, which may lead to infection.