How is the position of the lips measured in orthodontics?

Fortunately, advances in 3D imaging make it possible to take digital images and measure changes in the positions of the oral soft tissues at multiple time points. These advances in dental imaging allow for a closer look at the position of the lips and the alignment of the teeth. In 1968, Rickitz introduced the E-Line, one of the most reliable sources on orthodontics. Line E extends from the tip of the nose to the tip of the chin. Therefore, orthodontists prefer that the upper and lower lips are on average about 3 mm and 5 mm from the E line, respectively.