That's kind of my take on it. I started wondering why we need so many specialty soaps and decided you could use it for showering, shampoo, shaving. It probably would make a bad toothpaste though.
I can confirm, it is bad, I tried it camping once. But I mean you could uses it if you had no alternatives.
I can't really say how well it works; my teeth are in bad shape but that is presumably because I love sugar and vinegar. I think dentists would tend to recommend baking soda as the simple inexpensive toothpaste alternative, however at least one study someone mentioned here not too long ago found that using toothpaste vs water doesn't seem to make much difference. I've heard some theorizing about abrasive vs. non abrasive toothpaste but I haven't looked if there are any studies on that question.