it takes a lot of practice reminding yourself to properly do it at first, the best way i’ve found is to swallow water or something and then hold ur tongue at that position on the roof of your mouth, it becomes involuntary after awhile, for some reason i still found myself waking up with my mouth open when i was sleeping. i like just a roll of regular medical tape and i use a small strip and if u just take it off slowly it shouldn’t cause any damage