Oh, wow! This makes me wonder if tooth powder was originally more common and toothpaste a more modern thing.
Yes, it was. I know that from my parents and grandparents. During the Depression, people used salt or baking soda for tooth powder. Mom was quite poor as a child, so they didn’t go to dentists. If a tooth got really nasty, you washed your mouth out with alcohol or witch hazel water or vinegar, then grandma pulled it with string and pliers. You just did without.