Another thing you could consider is a bar of plain old pure soap - the kind you get at the health food store. Forgive me for not being able to back this up with a web site, etc. I can tell you that for the past couple of years I have spent a LOT of money on my teeth (amalgam fillings removed, etc) - and in my research - might have been Weston Price's site - I learned that pure soap is just as good as anything else for the teeth. It might sound awful - yecccch - soap in the mouth? - but honestly, it isn't.