I tend to use a blend of baking soda, sea salt, and various herbs instead of toothpaste. Strange as this might sound, it is nothing new. In fact, in the 1975 January/February issue of Mother Earth News there was an article entitled Natural Oral Hygiene where Thomas W. King shares a "3 parts baking soda (the cleanser and sweetener) with 1 part salt (the abrasive)" tooth powder recipe, and later in the 2007 August/September issue of Mother Earth News, Aubrey Vaughn sites a Whitening Sage Tooth Powder recipe from Janice Cox's Natural Beauty At Home.
For the past two years my wife and I have had great results using the tooth powder, but since our "recipe" is constantly changing, I figured I'd share a recipe found online:
..3 parts Baking Soda
..1 part Sea Salt
..3 parts Wachter's Cal-Mag-Vit C powder
..3 parts finely ground Prickly Ash bark
..1 part Echinacea powder
..1-1/2 parts Goldenseal powder
..Peppermint essential oil to taste (optional)
As you can see this recipe is obviously derived from the 1975 January/February issue of Mother Earth News, with additional herbs added based on their medicinal properties. One thing worth noting however is that Goldenseal has been listed on the United Plant Savers' At-Risk List, and should be replaced with a less at-risk herb. In addition, I enjoy adding one to two drops of Dr. Bronner's Magic "All-One" Peppermint Castile Soap to my toothbrush, for a minty taste and a traditional foaming mouth-feel.