I whitened my teeth overnight last night. Some of the bleach came out of the trays and was on my gums and tongue for a good 8 hours at least. The burning on my tongue has subsided, but there is now an extremely painful burning sensation along my lower gums. Also, the area that is burning has turned from the regular pink gum color to a white color. Did the bleach burn my gums? Also, what can I do to treat it ?