Where's That Paci?!

  I was a little concerned that my son suddenly began showing interest in a paci. He doesn't want to sleep with it, he just wants to chew and suck on it during the day. I chalked it up to teething. He now has three teeth and an unfortunate new habit. He likes to GRIND his teeth! He does this while he is awake, but not while sleeping. OH it makes my SKIN CRAWL!!! I find myself frantically searching for the paci so he will chew on that instead of grinding his little teeth. Anyone else have any experience with this? How do you stop a baby from grinding his teeth?