When people think about orthodontic treatment, they often focus on clear aligners as the main drivers of tooth movement. But a overlooked yet crucial factor is oral lip forces. The lips are part of the musculofascial system surrounding the teeth, and their constant, gentle forces can modify how teeth sit in the jaw over time. In fact, lip pressure balances tongue pressure to contour dental arches and dentition position.

The lips exert a resting tension on the front teeth. When this pressure is equilibrium maintained—meaning the lips are not too tight or too loose—the teeth tend to stay in a stable, harmonious position. But when lip pressure is abnormally high, such as in cases of detrimental behaviors like nail biting, it can force the anterior teeth palatally, leading to crowding or 墨田区 前歯矯正 an Class II malocclusion.