Abstract: Patients with cleft lip and palate frequently present with developmental defects in teeth and maxillary bone. They are affected by many factors, which are very complicated. The preoperative and postoperative perioral muscle pressures of patients with cleft lip and palate are different from those of healthy people. Many scholars believe that one of the factors leading to defects in teeth and maxillary bone is the soft tissue tension change after the operation. Now the research status of the oral peripheral force in patients with cleft lip and palate will be reviewed.

Key words: perioral muscle pressure, dentomaxillofacial development, cleft lip and palate