PlaqueOff is made for people as well, apparently. According to their website, it is a type of seaweed. This is what they say on how it works:
"Unlike other methods of plaque control ProDen PlaqueOff™ is swallowed and works systemically through the blood stream. It is thought to exert an effect through the saliva by affecting the ability of plaque to "stick" to oral surfaces, and by softening hard tartar (calculus) deposits. Improvements are normally seen within 5 - 8 weeks. "
So...that is theory. I can remain open to the possibility it might help a dog that was prone to plaque buildup. (But I am one that uses and believes in lots of holistic & homeopathic treatments... some other dental treatments in this category are the Petzlife Oral Care products, Leba III, and the homeopathic remedy Fragaria)
But I can't see any reason why a typical retriever would need it. Their mouths are shaped in a way that there is no crowding of teeth, they are usually good chewers (mine love to floss their teeth on tree limbs, fence posts and pretty much any other wood they find

especially the damn Chessies!).
Careful with the shin bones - I have seen a number of dogs break or crack their carnassial molars with those! I know some dogs chew on them all the time with no issues, I am just very cautious with large weight-bearing bones.
My dogs will be enjoying thawed newborn piglets tonight - they give a really nice dental workout! it kinda grosses out my husband though
