A wry mouth or bite occurs when one side of the jaw grows longer than the other. It is considered hereditary and difficult to correct. Base narrow canines occur when the lower canine teeth protrude inward and can damage the upper palate. Often this condition is due to retained baby teeth and can usually be corrected through inclined planes used to push the teeth into normal occlusion. For most breeds the scissors bite is ideal.
Scissors bite is one in which the upper incisors just overlap and touch the lower incisors.
In this condition the upper jaw is longer than the lower jaw. There is a gap between the upper and lower incisors when the mouth is closed. Some puppies that are born with an overbite might self-correct if the bite is no larger than the head of a wooden match. An overshot bite will rarely improve after the puppy reaches ten months. Some puppies with overshot bites will experience difficulties when their permanent teeth come in.