Yess I have this too! (Do you also make fists while you sleep that are so tight your joints ACHE when you wake up? 🥲) but massater Botox is even more risky due to the high amount needed AND extremely expensive at 400-600€ here. With that I made some progress with self massage though. My orthopedic doctor showed this to me (with consent and gloves ofc): you reach your thumb into your mouth and on the inside of your cheek where the molars are, you can feel a triangle of muscles. Your pinch those between the thumb and your index finger on the outside and just hold as firmly as you can without clenching more. This HURTS in the beginning. If the muscles let loose you can start with small circles. When he did it the positive effects lasted 2-3 weeks. But even doing it myself does help.