The powers that be say I can't say it does anything other than clean without a giant study on my finished formula. If you search for research on calcium carbonate and xylitol you'll find more reasons than abrasion and cleaning why they were included for sure. I spent about 1.5 hours with a muddle and the salt for this batch to get it down to a fine powder even though I started with Redmond's fine grade. That isn't multiple batches, just grinding the same salt all that time. I'm all about proof of work but if this scales at all I'll be looking for another way to get the goal size. Rather than eyeballing future batches the salt will be run through a 200 mesh sieve for repeatability. At 200 mesh maximum particle size the relative dental abrasion for the finished product should be around 30, well below the 80 limit recommended for daily use.