The first appointment for Invisalign establishes the roadmap for the entire treatment. Your Invisalign aligners will be worn from 20 to 22 hours per day. They will apply constant pressure on your teeth until they are in the correct and intended alignment.
Each set of aligners will be replaced every two weeks. To avoid having them slip during sleep, you can wear custom night retainers. This will ensure the right amount of pressure is placed on aligning your teeth even as you sleep.