No it is not common. Whitening trays do not work. They are cheaper but there is no way you can control the gel from getting in contact with your gums. I had to get it done professionally. paid more but worth it. 1 hour done.
I didn't feel anything when i did mine. I don't know what they used but i had no pain, no sensitivity. I guess it was because of my teeth. Everyone is different.
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