Normal chin-chest distance can maintain good facial proportion and head-neck posture, which is helpful to maintain breathing and swallowing functions. If the distance between chin and chest is too small, it will lead to mandibular protrusion, which will affect facial beauty and respiratory function; If the distance between chin and chest is too large, it will cause the neck to lean backwards, which will affect the head and neck posture and cervical health.
Doctors can evaluate whether the facial proportion and head and neck posture are normal by observing the mental chest distance, and provide corresponding treatment suggestions as needed.