While each case is unique, depending on the treatment needed, Invisalign usually takes approximately one year for adults. For teens, the length of treatment is comparable to that of traditional braces. For fastest results, you should wear your aligners 20 to 22 hours a day. As you wear each set of aligners, your teeth gently and gradually shift into place. Once you have achieved the beautiful smile you desire, we may recommend retainers to keep your teeth looking good.