The correct term for the teeth of pericoronitis is antimandibular, and the reasons for the formation of antimandibular may be bad artificial feeding posture, bad oral habits, genetic factors, etc., as follows. 1. Bad artificial feeding posture: If the pacifier is placed in a high position during feeding, it will press on the front part of the maxilla, which may lead to underdevelopment of the maxilla, and the long-term use of soothers may lead to over-extension of the lower jaw, which will lead to anti-mandibular. 2. Bad oral habits: finger-sucking habits can lead to mandibular protrusion, biting the upper lip can lead to maxillary compression and mandibular protrusion, resulting in the formation of anti-mandibular. 3. Genetic factors: Usually when parents have anti-mandibular symptoms, children have a higher chance of having anti-mandibular symptoms. There may be other reasons for the development of jaw reversal, so it is recommended to go to a regular medical institution to receive professional and targeted treatment as soon as possible.