Yes it makes sense. Once they are driving they can take themselves to the orthodontist.
Of course the HS my dd went to had a great system.
You would send in a note and the kid brings it to their counselor the day of and they give them a pass to get out of class.
The kid can take themselves if they drive or a parent signs them out at the office.
The kicker is they need to bring back an excuse note from the doctor.
The child is held responsible for checking in and out of class and getting the notes to their counselor.
It taught my dd responsibilty.