So I was brushing my teeth tonight and I had the best idea! The double-brush! It's got bristles on both sides, so you can brush the top and bottom teeth at the same time! I was so excited, I got online to tell one of my friends about it.
Apparently, it already exists. Oh well.
Oh, just for references (so I'm not committing plaigarism or anything like that) the website is http://www.invention.net/ford.htm