What is a good subtopic to teeth whitener?

If you just start writing, you will be through with your assignment before you know it!

ummm..actually! :)... think about some questions you would ask about TEETH WHITENER. examples: How does it work? What is it made of? Who was it invented by? .....Then make that question into your subtopic title. Then you look up those questions! If you can't find an answer to the question then I suggest choosing a different subtopic. Now that you are on the right track, Start writing! Gald to help!

(I didnt write the top thing by the way!)