It does actually work,
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This review is from: Proden Plaqueoff Animal for Dogs 180 g
My dog will not let me brush his teeth. This stuff has kept his teeth looking great and I never brush them, make sure to give him a bone or dry food (or something hard to chew on) as this softens up the plaque meaning it will easily come off when the dog is chewing on something - it still requires checking to actually remove the plaque though! Also, don't expect it to work overnight - give it a couple of months!