“Get in the fucking robot Shinji” is yet again a major plot point.

In my experience, it does not clean as well as string floss, but it has better reach and ease of use. It helps a lot if you have a trouble flossing or if you have braces, but it does not get in-between teeth as well. It can’t replace string floss, but it’s a good alternative.

I recommend one with enough capacity so that you don’t have to refill more than once. Also consider the pressure of the water as, in my experience, only the high settings clean my teeth well.