The short answer is yes, Invisalign are just as effective as traditional braces in straightening your smile. In fact, it is believed in moderate and mild cases, Invisalign actually works better than traditional metal braces as they apply pressure all around the teeth in order to move them, where as traditional braces pull from a specific point on a tooth where the bracket has been attached. It is important to note, that in more sever situations of over-crowding and crookedness, metal braces may be needed to straighten the teeth.