Baking soda was the original poor man's toothpaste. Millions brushed with it for decades back in the early part of the century. When I was a kid, many many moons ago, my dentist even recommended it as a reasonable alternative (we already had fluoridated water, so that was taken care of.)
So baking soda certainly won't hurt your teeth, even over the long run. The Arm and Hammer dental soda, with fluoride, sounds like the ticket. There are still some towns that don't add fluoride to the water, including mine.
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