8 years ago my mom got me metal braces from a dentist who extracted four of my teeth behind the canines. I didn't wear my retainer for too long and now my gaps have become really large(close to 3 mm). How can I close out the gaps - (1)can i consider dental bonding?(2) or can i do invisalign treatment for this situation, or will metal braces be better in my situation? How long can it take? (3)if I go ahead with orthodontic treatment, will i have to wear retainers? for how long?