About 3 weeks ago, I had a crown put on my tooth,(bottom right, second to the last tooth). About 3 days later, the right side of my jaw began to get stiff. Opening my mouth more than an inch, even yawning, is extremely painful! I called my dentist, she said to apply heat and take Advil...I have been doing this but there is no improvement at all. Sometimes I think it may even be getting worse. What do you suggest?