Abstract: A first mouthpiece having a flat heel surface 12 which rests directly on a horse's bars, a tongue porte 14 of sufficient size to receive a horse's tongue and of such height so as not to interfere with most horse's palates, a horizontal tongue shelf 16 of sufficient length to provide a comfortable resting place for the tongue, a rotation mechanism 32 and a rotation stop 30 embedded in the inside end 48 of a right mouthpiece extension 46 to protect the tongue. Rotatable right and left mouthpiece extensions 46 and 40 are coupled to the cannons 10 to isolate rotation of bridle reins from the cannons.