It depends on the arrangement of your teeth, and what is desired from an aesthetic and functional point of view. Teeth that are exceedingly protruded need to be pulled in, so as to prevent trauma from accidents. Teeth that are too inclined will also look better when they have been pulled into a less extreme inclination. Often, when the teeth are pulled back, the lips follow to some degree, depending on each individual’s tissue structure. This would be good for those people with protrusive lips.
If there are spaces available, the teeth can be pulled in easily. If no space is available in a crowded jaw, then space has to be created. Removal of some teeth will create space. If only a small amount of space is required, the teeth can be slowly filed down on their sides with an abrasive metal strip. The entire set of teeth can also be driven back with other orthodontic devices, such as transpalatal arches, headgear, temporary mini-screw implants or removable appliances.