More investigating of the toothpaste situation has led to the following recipe. The Myrr powder and peppermint oil I found at the natural drug store (it's Boulder. We have more of those than the regular kind.) I've whipped up a batch and stashed it in a little glass jar with a lid. Then, I just wet my toothbrush and dunk it in the powder. I know peppermint doesn't really make my mouth cleaner and it's only in my head, but I don't care. I bet if I stuck a vanilla bean in there it'd be just as delicious as my old Crest brand...
Three Parts Baking Soda (whitens teeth)
One part Salt (polishes teeth)
A few drops of Peppermint Oil (tastes yummy)
Myrr Powder (kills germies)
Price = 10.48$ for a lb of Myrr powder (this will be enough for years of tooth brushing! Hope it doesn't go bad), 3.55$ for 1 oz of peppermint oil (again, enough for more than a year)
Old Crest Price = 3.74$ per tube x 6 tubes a year = 22.44$
Hooray! My version is much cheaper and doesn't fill the landfills with all that plastic!