Felt like I burned my tongue with coffee

I used the tongue guard and the tip of my tongue ended up swelling. I took it out, the swelling went down in a couple of hours but it left my tongue feeling weird for the rest of the day. Felt like I burned my tongue with coffee. Maybe I did it wrong but I followed the instructions and I even watched youtube videos to make sure I was doing it correctly. Really bummed that It irritated me instead of helping with my snoring.

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