Avent orthodontic, collapsible and symmetrical nipples respect the natural development of baby"s palate, teeth and gums, even if the pacifier ends up upside-down in the mouth. All Avent pacifiers are made of silicone and are taste and odor-free, so it"s more likely to be accepted by your baby. Silicone Pacifier - 2-pieces Snap-on protective cap - 2-pieces