http://www.onlynaturalpet.com/product_detail.aspx?item_guid=8b381ea8-8baf-4349-a473-f08da68a8ea0
I recently bought this for Pebs to help with the tarter that was forming on the canine tooth that she had broken off this summer when dealing with all her SA problems. Well the tooth came out when she got spayed, but I continued to use the product because...well I bought it I should use it.

After 6 weeks it has helped so much! Her light tarter is completely gone and the dark hard tarter closest to her gum line is remarkably lighter and receding! Her gums are nice an pink and her breath has improved some. All the while I've increased her wet food consumption (which I believe increases tarter build up). Fantastic product that I thought I should share with you all.
A tip that I have found making it "easier" to give. I have a 2 gallon water container from wal*mart that has a spigot attached. I just fill it up and add 2 Tbsp of the plaque off and I'm set for almost a month. I don't have to worry about wasting any, over dosing, or under dosing every time I fill the bowl up.