What contributes to anterior teeth proclination?

Proclination of the anterior teeth refers to the forward tipping or movement of these teeth from their normal position. One significant factor contributing to this issue is the presence of incompetent lips. When the lips do not close properly or have inadequate muscle tone, they fail to provide the necessary support to the anterior teeth. This lack of support can lead to increased force on the teeth from the tongue or other functional movements, which in turn can cause the anterior teeth to tilt or move forward.

Incompetent lips may allow for more tongue thrusting and other movements that place additional pressure on the anterior teeth, promoting their proclination over time. Thus, the structural and functional role of the lips is critical in maintaining the position and alignment of the anterior teeth in the dental arch.