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You can try Petzlife, which is half of the price of Leba Lab III. I have started using it on my dog and it has really improved her breathe. I'm assuming the tartar takes time. If possible try to brush your dog's teeth. If you can't, try a wet washcloth and wrap it around your finger. It's a matter of your dog getting used to the routine, and of course lots of praise and perhaps a treat when your finished! :)
You should look at your dog's food as well. There is special food specifically for dental issues. Talk to your vet. Good luck!