1. Finger-sucking habits: lead to malocclusion, narrow dental arch, high arched palate, protruding upper front teeth, open lip exposed teeth and distal malocclusion and other deformities, and calluses and digital curvature may also appear on the fingers.
2. Bad tongue sticking habit: can form partial open bite of anterior teeth; tongue licking habit can make the anterior teeth tilt to the labial side and cause gaps; tongue sticking habit can easily cause anterior teeth open bite and mandibular protrusion deformity.
3. Bad habit of biting the lower lip: it can cause the upper front teeth to be tilted towards the lips and the interdental space will appear, the lower front teeth are inclined and crowded on the lingual side, and the face is manifested as open lips and teeth, upper front teeth protruding and lower front teeth retracting, etc. .
