How do you get plaque off dogs teeth?

I got a one year old chow/lab mix last week and I was looking at her teeth while I was grooming her and noticed a lot of plaque. She's eating a high quality hard dog food. Her front teeth aren't to bad but her back teeth have a good bit on them. I know you can take them to have there teeth cleaned but I... show more I got a one year old chow/lab mix last week and I was looking at her teeth while I was grooming her and noticed a lot of plaque. She's eating a high quality hard dog food. Her front teeth aren't to bad but her back teeth have a good bit on them. I know you can take them to have there teeth cleaned but I can't afford that right now. I havn't tried brushing her teeth yet but I don't think that will really get what's already on off. I've been brushing my other dog's teeth since she was a pup and she doesn't have much if any on her teeth and she's a year and a half. So, do you know of anything you can buy to help get rid of plaque? Thanks.
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