My mali female does the teeth chatter every so often under various scenarios. Sometimes when she is in super drive, sometimes when she is snuggling in to relax, sometimes after a yawn. She has pretty massive jaw muscles from tugging and the like, so I imagine for her it is just a relaxation type thing. I've also heard it can be a sign of tooth pain, so that's something to think about.
Be careful with any drugs that disrupt heat cycles. As I'm sure you know, doing this tends to drastically increase risk of pyometra.
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