Aren't those to prevent pregnancy. No, different product. I think many use them to make bits easier on their teeth, but they only cause me to flex my jaw muscle against the softie, like you squeeze one of those hand exerciser balls, and that makes my jaw sore and my teeth tender. I guess I'm a bit tightly wound, as they say. I have used them in the past to make soft MM cob bits last longer, but now I just refit them with Forever acrylic stems or buy the MM stock pipe with acrylic stems.