For about half a year I use Listerine with Tartar Protection. What can I say, the formation of tartar with me now tends to zero!
I use them undiluted each morning and evening after brushing and rinse my mouth with it for about a minute. The solution tastes a little spicy but not unpleasant. In addition, you have behind a pleasant fresh taste in your mouth. The lid can be used as prima dosing.
But there's me 5 star and a strong buy recommendation.