Iodine for dental health

I'm trying to research using Iodine (instead of fluoride toothpaste) against tooth decay. My 3 year old son has cavities, the pediatric dentist immediately wanted to schedule him for dental surgery under general anesthesia for carries in baby teeth that are not bothering him at all! He is still breastfeeding some (of course the dentist insisted THAT had to STOP.) Guess what, we are not going back to them. In any case, I do know there are some small cavities (yellow orange spots) as I can see them on a few teeth but they said 8 cavities and I think they were trying to drum up extra business.

Immediately I started researching curing tooth decay naturally and got a book by that title. I have not figured out how to get my son to take the cod liver oil but I have made great strides in minimizing the sugars and refined carbs in our diets. Working hard to make sure any seeds, grains and nuts are soaked, sprouted, or fermented.
We have our own pastured chickens for eggs and get raw milk from local Jersey Cows on pasture and a NON Genetically-Modified-Organisms feed supplement.

Anyway, I've seen videos of a dentist railing against fluoride and saying that brushing/rinsing with Iodine can kill off the bacteria that causes tooth decay but he never really says or links to any details about how to go about it.

I have some 5% Lugos Iodine. I tested both myself and my son with a patch of it on our inner upper arms. Mine was gone in under 12 hours. My Son still has a little bit of a patch showing at 14 hours.

What do I need to know and what sort of Iodine should I get in order to clean his teeth. How do I go about it? He is very picky about what is used on him and what he eats. It is near impossible to trick him, he is very sensitive to smells and tastes and notices very minute variations in things. I know the Lugos can be harsh in the mouth so I need to make sure it is dilute enough not to burn or cause him issues or I'll never be able to get near his teeth again.
Any Tips? What do I need to know when using and supplementing Iodine. Tweet