Hah. You're right. My dentist thinks all this stuff we're doing is ludicrous and complete rubbish. I mentioned to him that I thought maybe swishing had washed away the cement, and he even talked over the end of my sentence and went back to his theme of decay, bacteria, and having more work done to combat it. But of course he did. His livelihood depends on it.
I'm going to a holistic dentist next week for a second opinion on everything.