Once you start Invisalign, you'll get great results, but only if you follow the plan. You absolutely need to use your Invisalign as directed, or your teeth will start to move backwards, interfering with the entire process. Here's a more detailed analysis of what can happen if you stop using Invisalign ahead of schedule. Other people may not even notice you're wearing them, making the Invisalign treatment a perfect fit for your lifestyle.
Once you stop using Invisalign, you should use orthodontic retainers so that your teeth stay in place while new bone is deposited. It takes 9 to 12 months for the body to build up enough bone to stabilize the teeth.