Trismus is a most common Post extraction complication with wisdom tooth removal. Please do warm saline gargle followed by jaw opening exercise specially first thing in the morning. Don't worry, it will be fine soon.
Next Steps
Take Flexon MR twice daily for five days.
Health Tips
(After gargle) Put your 3 fingers in between jaws and push them away. you may feel discomfort initially but trust me next time you will feel muscles are much relaxed.