WY10 Teeth Whitening and Burnt Gum

I purchased wy10 teeth whitening trays and gel...

i purchased wy10 teeth whitening trays and gel from dentist. on second use a little bit must have escaped from the tray and within 2 minutes i could feel my gum burning. i removed the tray and found that the bit of gum tissue between my front teeth had turned white and an area around it looked red.

this system cost £260 but i don't want to damage my healthy gums. what should i do?, thanks, dianne.

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