I have purchased a total of 11 of these bottles and have not noticed any reduction in tartar. I have tried rinsing my mouth with a solution of this product and water and have also used my Waterpik water purifier (which I consider waste) with a mixed solution of this product and water. I keep checking the health of my gums and tartar and I see no difference in the last 5 years. The only difference now is that my teeth are more sensitive to brushing. I will not buy again, the powder sticks together.
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