05-21-2012, 05:44 PM
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If it's been more than a couple years since the teeth were done and the head tossing is a recent development, odds are there are some some sharp edges in there causing pain. Getting teeth floated yearly is pretty common, though some horses will need it done more or less frequently.
If the teeth check out OK, have the vet also look at eyes and ears, and if all those are OK, then re-evaluate bit type and size.