[Jean]

crb,
Wear soft comfy clothing, layers are best. The treatment rooms tend to be cool. Don't drown yourself with drinking water, but do hydrate yourself to flush your system. 8 cups of water is good.
Eat smaller lighter meals that are protein rich.
Now you are a dentist so you will already know to change your tooth brush frequently during treatment. The mouth area changes with treatment and mouth sores can be an issue. So keep bacteria at a low by changing your brush often. I also found that yogurt during treatment not only was a good source of protein but also provided a ph balance for mouth and stomach and gut. As the others have mentioned it is a long day so go prepared for a long visit. Take a good book which can absorb your attention. I find reading relaxing.
Good Luck tomorrow. The unknown is the most draining part of the treatment. Once treatment begins you can begin to unwind a bit.
Kind Regards,
Jean