I've been a “tooth grinder” since I was about 12. After 30+ years of this behavior,I had begun to wear away the surface of my lower teeth. My Dentist thought I would benefit by wearing a “bite guard.” He genuinely thinks a custom made one is more effective than a store bought, one-size-fits-all bite guard you can obtain at the Drug store.
SO...I had a cast made of my lower teeth so he could make a bite guard for me. Incidentally, I am NOT a big mouth, they had to use a pediatric tray for the molding.
I wear the bite guard every night while I sleep. When I'm not wearing it, it resides in its holder soaking in antiseptic mouth wash. I've always stored it this way. Imagine my surprise when I took it out of the new green mouthwash only to discover the guard had turned a translucent green! I had a good laugh over that.
After being in my mouth all night it's back to its normal, UN-colored state, but I still chuckle when I put a green guard in every night. At least it tastes good.