Two words: conical nanohydroxyapatie. Use premio apagard from Japan. Don't put fluoridated anything in your body, especially drinking water. Get a berkey filter with berkfeld fluoride filters. Use turmeric extract/curcumin to de-calcify your pineal gland.
It matters regardless of how old you are, but especially keep kids and babies away from this neurotoxic jewish poison.
I'm in an apartment so nothing I can do about the shower but I have reverse osmosis filters on both the kitchen and bathroom sinks. I started avoiding fluoride as soon as I started college in the 90s using a distiller for all drinking water.
Good.