I recommend the mini gua sha.

Do you use gua sha products? I keep a gua sha stone smaller than my palm within reach in the office and use it frequently.

Yesterday, I yawned so much that I suddenly got a sharp cramp in both sides of my jaw. I was flustered, but when I massaged around my jaw with a gua sha stone, it naturally went away. I also often use it when my legs feel swollen from sitting for a long time. I even massage my scalp when my head starts throbbing.

This is good.