It is hard to give you a complete answer without seeing your initial photos, however, closing spaces generally is pretty easy. It really depends though on what your overall bite looks like before treatment, specifically your "horizontal overbite" or what we call in the dental world, overjet. If your overjet is too minimal (0-1.5mm), this must be taken into account by moving your lower teeth back slightly, otherwise you could end up with an edge-to-edge bite. If you overjet is too large (4mm or more) than a plan must be carefully chosen that results in a normal overjet so that your front teeth all tough evenly together when you finish. At the end of the day, the goal for a healthy bite is to get all of the teeth to contact at the same time with the same force so that they protect each other. Sometimes at first glance a bite problem can look like a simple fix, but may be bit more than originally thought. My advise to anyone considering Invisalign would be to get evaluated by a trained orthodontic specialist. Hope this helps and good luck!
