a pacifier or dummy includes a resilient nipple , a guard , and a plug body inserted into the end of the tubular portion of the nipple that is opposite to the mouthpiece . the plug body is carried by a base , which is supported by the guard and is resilient in the direction of the longitudinal axis of the nipple . the plug has projections , which are particularly formed with beveled surfaces and movable along the axis of the nipple . the guard is provided with beveled surfaces adjacent to an opening in the guard . in response to a pull on the nipple , the base is resiliently deformed and the projections of the plug move toward the beveled surfaces of the guard . the plug body has outwardly protruding projections , which are oversize with respect to the clearance between lugs formed on the guard in the opening .