Never heard of it before....just looked and see it is part of the human dentist's (self proclaimed dog food advisor) growing way of making money.
There is a lot of free information on the web about dog food. No way would I pay that man for any of his information.
You can ask all the questions you have about dog food here and the person giving it is a vet nutritionist. AND, it is free!
PetDiets - VNC putting your pet's health first .. for more than 20 yrs!