Braces are used to align teeth and prevent future problems. They are fitted by an orthodontist and can be made of metal, ceramic, or be invisible. Metal braces are common for children and involve brackets on teeth connected by wire. Ceramic braces have a clear appearance. Lingual braces are hidden on back teeth. Invisalign uses custom aligners that are replaced regularly. Braces fitting is not usually painful and discomfort from tightening is mild.