hi andrew, when i was a teenager i had braces for 4 years and the result was very good, as advised i kept my retainer in for 6 months (since i have read i should have kept them in for a lot longer)…since then they have slowly reverted back to there old shape, i am now 26 and really do not want to wear the dreaded train tracks again, what other possibilities are there and would behind the teeth braces rectify this problem….the main problem is my two teeth either side of my front teeth are behind, thanks for your time