Invisalign and Investment Banking

I am going to get invisalign just before my 2nd year of uni, in my 3rd year I will be doing a placement so I am wondering, for those who have had it, who did you get to your appointments as they'd be in the week days for me. Did your employer allow you to miss work for a couple hours? I would have to come back to my home town which would probably for an hour and half train journey if I hopefully end up in London.