For ultimate camouflage, tray or aligner systems render a modern straightening method. Designed with sophisticated software and 3D digital models of your teeth, a series of clear plastic trays produce the straightening results. Medical-grade plastic without wires, metal, springs, or rubber bands gently moves your teeth into place. Gradual pressure on specific teeth with each aligner means less discomfort and shortened treatment times, in many cases. Your provider dispenses several sets of aligners at a time, allowing you to change to a new one at home every two weeks.