What’s wrong with calcium carbonate? I know if you use it by itself it can cause spots that are whiter than others on teeth, but ingesting it in small amounts it isn’t bad I don’t think, I use it for heartburn(as in just baking soda mixed with water, but even the commercial antacid tablets contain calcium carbonate and magnesium carbonate) and that is much more than you’d get from toothpaste
What’s wrong with calcium carbonate? I know if you use it by itself it can cause spots that are whiter than others on teeth, but ingesting it in small amounts it isn’t bad I don’t think, I use it for heartburn(as in just baking soda mixed with water, but even the commercial antacid tablets contain calcium carbonate and magnesium carbonate) and that is much more than you’d get from toothpaste
Probably how it’s mined from limestone and similar deposits. They’re probably not checking or filtering it from lead-adjacent sources or something.