“Opalescence Teeth Whitening”

I started using Opalescence 20% with some custom made trays from the dentist. I don't wear them overnight. I have worn them 4 times (4 days) about 3 hrs a day. I was told to actually wear my bottom tray everyday because I have a tooth that needs to line back up with its neighbors.

So, I have this PAINFUL place on my gums on the bottom and I don't know if it's a chemicals burn, or irritation from the tray. It's not red. It's white - just under my tooth and a little below my gumline.

There also looks like tiny little white dots in it. It's freaking me out. I'm scared to eat - it hurts like HELL to brush but I know I need to. It doesn't bleed easy though.

Here is a pic - sorry the quality isnt the best though.

Oh - and I have started swishing warm salt water (started this last night)