I started Invisalign 1 month ago. Since my rear bite is open it's taking 12-18 mos. I got buttons on almost every tooth except my front 2 top & front 2 bottom; no one notices anything unless I smile unusually wide. I was told I would later get a button on one top front. Can this be avoided? I'm a young attorney and pretty social. A button on the front tooth will be easily noticed. Can it be attached to the back of the tooth? What if I refuse it(i wouldn't mind a longer treatment)? Thank you.