Veneers are used to correct cosmetic defects on teeth or to correct the bite (the way the teeth come together). Cosmetic imperfections that can be corrected with veneers include teeth that are slightly crooked or stained, chipped teeth, gaps between teeth or uneven teeth. In the past, the only way to correct these or other imperfections was to cover the teeth with a crowns. The advantage of veneers over crowns is that the teeth need less extensive shaping prior to the procedure.