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Third: Check the size of the bit to the size of his mouth. There should be no more than one finger width on either side of his mouth and the bit rings. Then check that the bit sits in his mouth properly, not too high and not too low. If the bit is too low, he will keep his mouth open, and will fiddle with his tongue in trying to find out what happens if he can get his tongue over the bit. If the bit is too high, it will cause a "gag" type of effect. The bit should only create two creases in the side of the lips when in the mouth....if a snaffle or a kimberwick. Curb bits and pelhams I try to only have one crease in the sides of the lips of the horse.