I've had my braces taken off over two years ago with cemented/bonded retainers on my top set of teeth and also reg retainer. Although straight, I noticed there is a gap on the front side of the tooth between tooth 9 and 10) and the middle section isn't "perfect". One of the tooth is a bit more square than the other. I've decided to get my teeth bonded to close the side gap and to shape the front teeth better. Would I need a new set of retainer after?