I'd highly recommend Invisalign, I've used it a few years back and it worked perfectly, plus it's nice to be able to take them off to eat and brush your teeth. The nice thing is that my dentist also gave me some bleach to put into the trays to whiten also.
The only thing that they don't tell you about invisalign is that they use cement to create little notches on some of your teeth to give the trays more leverage to help move the teeth, it matches your tooth color, so it's not so bad though. I'd do it all over again if I had to.
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