Okay, I cheated. I couldn't bear to show this old strip with that horribly rendered old mouth on Hazel, so I fixed it, because eventually I learned how jaws work* and I would like this strip to reflect that learnin'.
*your jaw rotates and your chin moves back toward your neck when you open your mouth. I know that sounds obvious, but it's amazing how much that'll trip up an artist who doesn't stop to think about it! And now you know.