Hi, I am 21 years old and wore braces for 3 years. At one point I lost my retainer and had another one made, but the new retainer did not fit the same and has caused my two front teeth to move apart again. My dentist told me I was a perfect candidate for Invisalign, but I cannot afford to spend $4000 after I already paid so much for braces. Do you recommend orthofill bands? Or can you suggest another cheap alternative? Thanks!