Jaw cracking

[Snappy Flossers]

My jaw constantly cracks when I open and shut my mouth. This started happening over the past year. I'm guessing I miss aligned my it somehow. My jaw cracks even when I'm eating something very soft like yogurt or jello. Can anyone recommended any exercises that might fix this cracking? I asked my dentist and she suggested opening and closing my mount with my tongue pressed firmly on the top of my mouth 10 times aday. Any other suggestions?

Thanks!