By hurting do you mean to ask: “Will the Invisalign treatment poke, prod or irritate your mouth or gums?” No, Invisalign is smooth and has no movable parts. Do you mean: “Will there be pressure on my teeth?” The answer to that is yes. With each new tray, there will be a short time of tension on your teeth. This is necessary to move them in the right direction. The solution might be some mild pain reliever coupled with the determination to keep wearing them as your teeth move into position. The vast majority of the time, wearing Invisalign causes no pain or discomfort for our Carmichael dental patients.