Tooth Whitening Kits
You can buy tooth whitening kits on Wish.
If you are OK with painting your teeth with something that arrives straight from China for $1 without any oversight or safety process, this is what you've been waiting for.
The "Teeth Whitening Liquid" comes in a small bottle. You put two drops on a cotton swap and rub your teeth for 1-2 minutes once a week. Make sure you rinse your mouth with warm water for five minutes after you do this!