We have had our bottle of Pet Kiss Brighter Bite Dental Spray for quite awhile now. This is because only a few sprays at a time are required, and because my dog is not a big fan of it. But even though she doesn't like it, I very much recommend it and plan to continue using it from time to time. The reasons I like it are that it's extremely easy to use (you just have to pull back the mouth to expose teeth and gums, then spray). The first time we used it, we were blown away. We sprayed one day and then when I went back to do it again the next day, all of the plaque that was there the previous day was gone. It was really incredible. My dog doesn't like it because it is mint flavored, and she hates the smell and taste. Because of that, I do switch it up with a meat flavored toothpaste and toothbrush that she likes. I wish they made a meat flavored version of this product, then it would be perfect!