Originally Posted by Bitless
As far as I know all a flash really does is keep the horses mouth closed
and no horse needs that, more likely they need a dentist.
What makes you think your horse needs one?
The teeth floating is one possibility but it could be that the horse is avoiding the bit. I have one that will ride around with his mouth wide open and try to get his tongue over the bit. Sometimes it's a training issue. I don't use a flash for him though, I just put an english cavason (sp) on with my western bridle for him.
But I agree that you'll want to figure out the exact reason for his chomping/etc before using the flash.
I keep editing my comments! This is one place where... OK SPIRITHORSE!!!! YES I'M GOING TO SAY IT!!!! That Parelli...MUMBO JUMBO... might come in handy because I bet it's more of an emotional/attitude issue then teeth....
Also - make sure your bridle is adjusted properly... and it could be irritation as well... he might be cranky because you are making him work....