Why do you have to have a bit for dressage competitions?

I don't really know but bitless can be a lot stronger than a snaffle, as we can see in controller headcollars. The nose is quite sensative and also it is the fact that they usually work on pressure and release rather than acceptance of contact.
This is only my guess so feel free to disagree
 
i would guess that it would be something to do with accepting the contact. not sure what everyone else thinks but i have never seen a horse going very well in a bitless bridle (i.e. soft, round, no resistance etc) any pics proving me wrong would be very interesting to see!
 
There are galleries on bitlessbridle.com and bitlessbridle.co.uk =)

Not all of the pictures show horses working beautifully, but I shouldn't see why a horse couldn't work to a very nice standard in one of these bridles =)
 
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