When the dog is alert, the skin above the eyes will form wrinkles, which contribute to proper Saint Bernard expression. Excessive skin on the head. The width of the muzzle is approximately equal to its length. Viewed in profile, the bridge of the muzzle is straight. Flews of the upper jaw are strongly developed and slightly overhanging, forming a gentle curve into the lower edge.
Lips are black.
The Saint Bernard has a complete set of evenly spaced, white teeth meeting in a scissors bite. A level bite is acceptable but not preferred. It is desirable for the roof of the mouth to be black. Overshot or undershot bite. The nose is broad with nostrils well open.