Treatment of the adult dentition falls into two main categories: 1) conventional orthodontics (braces) and 2) invisible braces (Invisalign). Invisalign came into vogue within the last six years as an esthetic means of moving teeth in the adult population. It consists of a series of thin, clear, plastic coverings that slip over the teeth and provide incremental correction of crowded teeth. They are worn full-time with the exception of mealtime and when brushing. Their advantage over conventional orthodontics is that they are more esthetic as well as more stable in the case of orthodontic correction of the TMD patient. This is due to their "mouthguard protection effect" upon the jaw. However, they are limited to treating only certain kinds of orthodontic problems and usually take longer to achieve orthodontic correction than conventional orthodontics. The decision to treat with Invisalign can only be determined after a comprehensive orthodontic diagnosis.