Myobloc can be injected into facial muscles in order to improve the appearance of "wrinkles in motion". These are wrinkles that are formed by muscle movement. Although the lower part of the face may be treated as well, physicians learning to perform these injections should concentrate on mastering the techniques of injection the upper face before attempting to inject the lower face. The techniques for injecting the upper part of the face are described here. It is important to remember that treating a patient's wrinkles with botulinum toxin requires knowledge, practice and an aesthetic eye.