Hi J.,
Fluoride is a HIGHLY toxic substance and children should NOT brush with it.
Anything that goes into the mouth regardless of whether you spit or not is absorbed into the blood stream. Google fluoride and see the MANY websites that talk about the ill effects this poison has in our bodies. Go to LeBleu Water's website. You will see all the toxins they REMOVE from their water - Fluoride is on the list!
Cavities are NOT caused by a lack of fluoride. They are caused by poor nutrition, too much candy and soda, and improper brushing. I have 4 children. None of them use fluoride and none have any cavities. They do however take vitamin and mineral supplements and they don't eat a lot of junk - and only have soda at B-Day parties not daily like most children today.
Parents are being lied to and because they TRUST doctors and dentists with their children's health they are falling for the lies. Do your research. The evidence is out there. Fluoridation chemicals are WASTE by-products of the phosphate fertilizer and aluminum industries. Fluoride is so toxic the fertilizer and aluminum industries are not allowed to dump it without serious fines so they sell it to unsuspecting buyers. It is pure poison! Sodium Fluoride is also registered with the EPA as a rat poison. Fluoride bio-accumulates in the body. My great-grandma lived to be 99. She died with every tooth in her head, nobody gave her fluoride toothpaste or fluoride drops. She also didn't eat processed food from boxes and cans. She did NOT have Alzheimers like most elder American's of today. By the way, Alzheimer's is linked to aluminum - of which Fluoride is a waste product.
Think about it... there is a reason why we are losing our minds in our old age unlike our great grandparents and those before them who's bodies gave out long before their brains ever did. Being poisoned from infancy on with NEURO TOXINS plays a huge role in our mental capacity later in life.
But please don't believe me. See for yourself. There are hundreds of "Scientific Studies" to back up what I'm saying. Here's a start...http://www.rawfoodinfo.com/articles/art_fluoridefacts.html
Be Well, T.