I believe that it is a major life change.
I believe it’s reduce depression because it’s says in the question “mental”
Try chewing some gum, of your choice,
don't use mouthwash for a bit (the alcohol can make your mouth drier)
reduce your caffeine intake, stay away from caffeinated drinks like coffee, and even soda.
Hazardous wastes and water pollution for sure. Maybe even potential reactor accident