I had Zoom teeth whitening 3 days ago. Apparently, some solution seeped under the protective gum coating and left a nasty burn on my gums. It now looks like a blister or an ulcer. I've seen this reported by a number of people, but no one ever mentions how long it takes to heal (or if it ever does). Should I be concerned about permanent gum damage? The first picture was taken before, the second picture was taken right after the procedure, and the 3rd picture was ta just now (3 days later).
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