Xdunlapx, that really depends on what exactly you have purchased. Surely it came with instructions? Unless a product is from a manufacturer with a good reputation, I wouldn't be putting it in my mouth.
There are certainly amazing bargains now on the internet, but you should take care to look for the the dentist-quality brands. You won't (or shouldn't) be able to purchase the concentrations used by dentists, but you can get the same brands for home use eg colgate visible white, poladay and polanight etc
hope this helps