My vet commented on how clean my dogs teeth were so clean for his age and breed. I use it in his water 2 weeks using and two weeks not using.

I bought this product after taking my 3 dogs to a new groomer who is pro pets--meaning no cages or anything that causes discomfort for your pet. She recommended after we discussed the strong jaw clenching dog breath odors. If you're like me, as soon as you start brushing one dog's teeth you're forced to play hide-and-seek with the remaining dogs. After a while, brushing became a chore and eventually stopped all together. But boy did I very quickly find out how right she was about how well it works! After a couple of days of following instructions and taking a few seconds to quickly spray in their mouths (I still have to seek) thanks to the extended nozzle, for once I did not wake up to the horror of dog breath. The bedroom was not reeking from 3 dogs panting and excited to go outside. My husband was amazed to smell his own not so fresh smelling morning breath. I ordered a second for back up and a gel version also after the groomer's recommendation. If you have dogs that you struggle to brush their teeth or spending hundreds of $$ for vet dental cleaning, this product is for you! I can only guarantee this based only on experience with my dogs.

It seems on the face of it that this is unlikely to work. However, another product by the same company was nearly miraculous in treating ear infections in my dog and the cat's teeth were a problem. I thought it was worth giving it a try.
After a few weeks, I think things have improved significantly I was able to remove some of the tartar with a scraper whereas previously, it had been too hard.
Also, while I don't think I can say the cat "likes" the treatment, he obviously likes the liquid's taste. He does not complain much and doesn't run when he sees me coming with it.
I don't think I can quite give it 5 stars, yet. But the signs are good.

Easy to get in my cat's mouth, hopefully it helps prevent dental issues.

Whitened my dogs canines in just a few uses! She hates it when I spray her teeth but it really works.