I have recently been given a mouthguard by my dentist as I grind my teeth at night and when I put it on my top set of teeth it instantly makes part of my gums white like it s putting pressure on the gums, and the longer I have it on the more discomfort I get from it a it starts hurting my teeth. It s bearable but i find myself wanting to take it out in the middle of the night, I was concerned, is this normal?- will my gums get use to it, is it affecting my gums? Thankyou.