BRACES!🤓

Hi everyone! Didn't know where to post this so hope I don't get hate for asking 😓
So after a year and six months I'm finally getting my braces off this Wednesday which is so exciting for me. And I will also get my teeth a bit shaved down so they're perfect as my dentist said. But I'm a little scared of it hurting, it makes me think of putting some sort of nail filer on my teeth lol 
My question is does shaving down teeth hurt? 
And second question is, how do you keep your teeth white besides professional teeth whitening which I will get once then I'm looking into natural stuff ofcourse because it's less damaging. 
Hope I can get answers🤞🏻
Sending positive vibes to all!❤️