Class II molar and cuspid relationships. Draw a line from the tip of the nose to the most anterior part of the chin. Another protrustive profile. Note hyperactive mentalis muscle. Protrustive profile on a young boy.
Protrusive profiles are extremely common on young children because of their small noses and chins.
Narrow, V-shaped maxillary arch. Serial extraction case. Cross-bite, maxillary central incisor. Serial disking of second primary molars to allow improved eruption of 1st premolar. Space loss due to early extraction without space maintenance of 2nd primary molars.