exercices

Hey all, could anyone give me some embouchure exercises. Some that I can add to my warm up routine and some exercises that I can also do when I'm up and about. It's been pointed out to me that my embouchure is terrible, that my mouth kind of stretches out when I put my mouthpiece in. Any help or...

I've picked up the clarinet seriously again lately after not playing it really at all for a few years and have noticed that I have a tendency to bite with my top teeth on the mouthpiece, especially in the upper register. I understand that the embouchure for the clarinet needs to be quite tight...