There is a deep median furrow that diminishes in depth from the stop to the occiput. Cheek muscles are prominent but free of wrinkles. When the dog is concentrating, wrinkles form on the forehead, which give the APBT his unique expression. The topline of the muzzle is straight. The lower jaw is well developed, wide and deep.
Lips are clean and tight.
The American Pit Bull Terrier has a complete set of evenly spaced, white teeth meeting in a scissors bite. The nose is large with wide, open nostrils. The nose may be any color. All colors are equally acceptable except blue, which is a serious fault. Haw should not be visible.