Hi, regular teeth brushing is the best way to prevent plaque buildup on teeth, also their is a product you can buy at Petsmart, it is a green liquid that you add to the drinking water, it smells minty and is supposed to help remove tooth buildup, and make the breath fresh. You can find it in the section where you buy the dog toothpaste and toothbrushes. I take my two guys about every 3 or 4 months to the groomers to have their teeth brushed and scaled, the groomer there has done a course on teeth scaling, and she does a really good job, but I've been taking them there since they were 8 months old, and do it regularly, so there hasn't been any buildup. I like doing it there because they get their teeth cleaned and scaled without having to be put under anesthetic.