Teeth are extracted for orthodontic treatment to make room for very crooked or protruding teeth, or to correct the bite. Changes that are part of the orthodontic plan – moving teeth back, for example – can change the appearance of the face. If the teeth protrude, moving them back will improve the appearance of the face; if the patient's profile doesn't stick forward, extractions should be avoided. Having your wisdom teeth out won't affect the soft-tissue profile of your face, unless the plan is to move all the teeth significantly backwards.
This answer is for general information. Your own case needs an examination by an orthodontist.