Burt's Bees is offering a free sample of their natural toothpaste. Get your sample here. It doesn't sound that appealing to me but I am going to try it out! I associate Burt's Bees with lip balm not toothpaste!
Swagbucks is totally free! It is a search engine that rewards you for searching! While you search you earn swagbucks that can be traded in for all sorts of things. My favorite is Amazon gift cards! Totally legit! Try it out!