There is a great number of orthodontic appliances. Some of the most common include Bands, Brackets, Invisalign, and a Mouthguard. Bands are a ring of metal, which fit around the back molars. Brackets are the small metal or ceramic modules attached to each tooth, Invisalign is a series of clear, removable teeth aligners that orthdontist use as an alternative to braces, and a mouthguard is a device that is used to protect your mouth from injury when you are participating in sports. They are important after treatment to protect your smile.