Yes, several. It's no fun, but it's probably still better than getting a cavity filled or a root canal and crown put in. The last time I only got one side done, I forget what happened where I didn't get the other done, but when they were going to do it years later, there was some problem with the insurance. Then I went back a while later and they tried again, saying they'd call me when the insurance clears to make an appointment, and they never called me. And I'm not paying $400 out of pocket for something that's probably not even necessary anyway. So it looks like I won't be getting any more deep cleanings done.