Traditional braces straighten your teeth by adhering a metal bracket to each tooth which is secured together with a metal wire. Then as the wire is tightened, your teeth move into place. With Invisalign your teeth are straightened by a series of clear plastic aligners that you change out every week. Invisalign is sometimes more favorable due to it being virtually invisible. The trays are worn 22 hours per day, and you do not have to put up with the metal braces. These trays are clear!