Stress can lead to teeth grinding which mostly occurs in night. Or it can b due to excessive mouth opening, talking too much, laughing too wide...
If d condition persist, it will lead too much stress on masticatory muscles -> headache-> jaw pain , neck pain.
Next Steps
reduce Stress, meditation can help, restrict mouth opening, visit dentist - night guard could help.
Health Tips
hve soft diet for few days, use hot fomentation over the joint. hope it helps.