Face muscle issues while on shrooms

The last few times I've taken mushrooms I've had an uncomfortable physical side effect. The muscles of my face, particularly my cheeks, behaved very strangely. They would get cramped and stiff in weird ways, so that, for example, I would be unable to smile without it looking like a snarl.

I was able to partially remedy it the last two times by manually massaging my face throughout the experience, but I could feel the stiffness still.

Has anyone else had this effect?

 

Cambodians sometimes make my teeth hurt..