psychojoe said..
Actually. I'm open to changing my belief system on this one. I'm considering not having a water filter on the next house just because of your comments. One of my kids doesn't like to brush her teeth properly.
So yes. Please do prattle on. I'll be reading it all with great interest.
Prattle v1

To the best of my knowledge, the vast majority of water filters won't remove fluoride from the water supply, hence the need for R/O. I still have an old work R/O unit at home and it is used daily for all sorts of stuff that is better done with pure water, so PJ, I wouldn't ditch the idea of a filter or R/O.
I am not sure where to start on the fluoride and tooth enamel stuff. Some background info perhaps? The enamel on your teeth is a rod like structure and looks like a packet of pasta viewed end on when viewed under magnification. If you could imagine a washing line full of footy socks lined up together, and each of those socks stuffed with quartz pebbles that's pretty close.
As your teeth form beneath your gums, the sock is laid down to act as formwork and then the grano-worker cells come along and dump a quartz like substance into each sock. Fluoride works by substituting into the 'quartz' filler and making it harder and more acid resistant. Once the tooth erupts into your mouth the grano-workers are done and dusted and no more quartz can be added. (Which is why you can't grow enamel back as an adult)
Except, nature is a bit clever and has added some more layers of defence. The enamel on a freshly erupted tooth is not fully mineralised/saturated, so you if you soak the surface in a mineralised solution the tooth will absorb more minerals. As Mrs Marsh said, the fluoride really does get in.
Hence fluoridated water and toothpaste is really helpful in strengthening freshly erupted teeth.
You can't overstuff the sock with pebbles. So as you age the benefit of F on tooth enamel reduces. However, the pebbles can be eaten out of the sock by acids. As long as you don't damage the sock you can top up the pebbles again if the environment is not acidic. Bicarb creates an environment where your saliva can get on with remineralising much sooner and faster. Toothpaste minerals can be good in this regard too.
You can damage the sock framework when it's not supported by pebbles. You cannot regrow the sock framework. So if you damage the sock, you can't replace any pebbles. (Pebbles are lost to acid attack). It's really important not to damage the sock framework. For example, when you have a spew and coat your teeth in stomach acid, the worst thing you can do is brush your teeth as the sock will be brushed away. Instead, rinse your mouth to get rid of the acid, again bicarb rinse is awesome here. Give the saliva a good half hour to repair/replenish the pebbles in the sock. Toothpaste is a good source of pebble minerals for repair too.
This applies anytime you bathe your teeth in acid - eg fizzy and sports drinks. I should add, that when you feed the bad bugs sugars, they form colonies know as plaque and churn out acid directly onto the enamel below -> decay is the result.
Congrats to the scrollers, here is the abstract: At any age F helps strengthen the surface layer of enamel against acid attack, but more so on freshly erupted teeth. Take special care to repair your teeth after bathing them in food additive acids.
PJ (assuming you made it this far) is this at all helpful?