[rewalker]

I want the least abbrasive material. I am more concerned with the active ingredients in the toothpaste. I will use many plant extracts. But I need to use a material in order to obtain the paste form and carry the herbal ingredient. Kaolin and bentonite clay and silica and hydrated silica are already used in the toothpaste widely. But which one should I try? What grain size? Fine clay dust are OK? I am looking answers to those questions and looking for recommandations.