Quote Originally Posted by mruffruff
My dogs love to chew on ropes with knots. It has kept their teeth pretty clean for the last five years. There is also a liquid that you can mix in their water to prevent plaque build up.
The rpoe toys ones have a note about this on their tags - supposed to be good for getting off plaque. I recall seeing some nylabone-type knobby toys that also advertising they help keep teeth clean.