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I started using a double bridle about 3 weeks ago and my horse keeps opening his mouth during the ride. Any tips?

I started using a double bridle about 3 weeks ago and my horse keeps opening his mouth during the ride. Any tips?
it may just be "too much bit" in his mouth, some horses have a thicker tounge than others and therefore less space for the bits. He might just get used to it after a while or you could try a thinner curb bit, yes thinner bits are considered more severe (and they are if used incorrectly, as any other bit) but it might still be more comfortable for your horse. It might also help to try another shape of curb bit. But finding the right bridle and bit combination for a horse is tricky especially with double bridles.
Thanks @davidlucasrider. Can you tell me how I make sure the bits fit him? I have kept my contact very light as my horse is light in the mouth as well. He has had a good neck posture and done all exercises well with the double bridle, even the forwards and downwards neck on the trot, so I can see he is seeking the contact. He has also jept above the vertical. The only problem seems to be the open mouth.
Hello Sofia,

First of all you need to make sure the bits fit in your horse, if it's too large or too small it can hurt him. Also the curb chain needs to be well adjusted.

Then if you're sure the bits fit, try to soften your hands as much as possible. You should start with simple exercises to put the horse in front of your leg and to relax his mouth.

If the horse chew his bits and slaver, that means he's starting to release his tension.

Good luck, hope it helps :)
I used a pelham before and he accepted it well. The dentist came a couple of months ago so that is not the problem either.
It may be the bit ,have you been using the same bit