Grinding, neither sexy nor tasty

So about a year ago my dentist figured I'd become a grinder, which might also explain the weird random headaches I started getting. Down in Chile I got a thermoplastic bite guard, and I've used it or others for the past 9 months. You're supposed to only for 6, but I never heard why.

I finally splurged for a 'real' fitted guard, and picked it up today.

"How's it feel?"
"Weird. It's hard. I'm used to the thermoplastic ones, being squishy cushions for my teeth."
"Oh no, that makes it worse, it's like giving your jaw muscles a workout all night. This just shuts the grinding down."

ffffuuuu. If I'd known that, I'd have acted earlier.