bit

Using marshmallow fluff to mimic foamy saliva in your horse’s mouth is no longer allowed in dressage competitions per the FEI and USEF. Marshmallow fluff and horses makes them appear to be softly chewing the bit and accepting the contact, but it can hide an open mouth, blue tongues, and resistance to the bit. Foamy saliva and sweat do no indicate relaxation or stress in horses.