Invisalign clear aligners work the same way that traditional braces do. They apply carefully controlled forces to move your teeth into a better position without using metal wires. The plastic trays are specially designed to fit your teeth, and will slowly move the teeth from their current positions to the best possible alignment. This process is broken down into a few different stages, where you will have a different set of trays for each stage. Usually each stage lasts a few weeks, and you are advised to wear your trays for a minimum for about 20 hours per day. After each stage, you will receive a new set of trays and repeat this process for gradual movement of your teeth. This will continue until your teeth are perfectly realigned.
Invisalign has even added features to the trays for teenagers like spacing for molars that have not grown in yet and compliance indicators that allows the dentist and the patient to see if the trays are being worn for the appropriate amount of time.