Mouth convex is a more common facial type, teeth and upper and lower jaw anterior protrusion caused by the lips forward, generally related to genetic and acquired factors, can be measured or observed on the side of the face, to assess the lip position with the tip of the nose, the mandible and other facial parts of the distance and proportion, to identify whether the mouth convex. 1, measurement: you can be connected to the tip of the nose, the chin before the point of the straight line by doing a line, if it is the case of a normal, the upper lip should be located in the If it is normal, the upper lip should be located on this straight line. If these three points are not in the same straight line, it is necessary to observe which part is not in the same straight line, so as to make a judgment, if the lips are convex forward and more than 2mm, then consider it as a convex face type; 2, observation method: you can take a picture of the side of the face with eyes looking forward and back teeth clenched tightly, if the point between the eyebrows, the point under the nose, the point in front of the chin is in the same straight line, then it does not belong to the convex mouth. If the lips protrude in a straight line, the mouth may be convex. It is also possible to observe the presence of a gummy smile, etc. If these two symptoms are present, then there is also a possibility of a convexity of the mouth. You can also observe whether your mouth opens unconsciously. If you open your mouth habitually, you may also have a convex mouth. Orthodontic treatment is closely related to the shape of the face, as the teeth play a supporting role for the lips. If the convexity of the mouth is serious, you can go to the stomatology department of a regular hospital to find out the cause of the convexity of the mouth, and correct or treat the cause.