my dentist says i have 2 teeth that need a root canal. so i am going to get the first one done on friday that one is the top molar at the very back. but the other tooth hurts the most and that is on the same side on the top the 3rd from the back.

i would rather have the root canal in the one that hurts the most first to relieve the pain. should i call before the appointment and tell them what i want or can i just tell the dentist when i go in on friday??