I'm getting invisalign. I will have buttons and rubber bands on my back teeth starting from tray 1. I understand buttons, but I am not sure what rubber band elastics do. I was told that I am classified as class 3. I have an overbite in the front but underbites with my side teeth. I am not sure what that means. Can someone explain? Any tips/tricks for using rubber bands with invisalign? I’m very nervous and stressed about this. I have had traditional braces before, but never with rubber bands.