This superior orthodontic treatment system has made consistent advances as an alternative to braces and can now treat various types of orthodontic problems including: Overbite - when your upper teeth go over your lower teeth. Underbite - opposite of overbite, when your lower teeth cover your upper teeth. Overcrowding - when you don’t have enough room in your mouth for your teeth to align correctly.Gaps between teeth - Invisalign can close the gaps between your teeth from either missing teeth, teeth coming in in the wrong place, or your jaw growing abnormally. Crossbite - When one or more of your upper teeth bite inside your lower teeth.