Dogs love the smell of our breath and they love to chew on things.  Those facts can result in some rather expensive and frustrating events.  If we have something that we put in our mouth and then leave around where they an get to it, they may.  Although I usually hear about night guards getting chewed up, it could be your bleaching trays, retainers, or what this dog got a hold of…..

I have never personally heard of this one but it is along the same lines.