The NUK Space Soother is designed to leave as much space as possible around the mouth area and touch as little skin surface as possible in order to reduce irritation. It has an approved orthodontic shape with a soft and flexible baglet to reduce pressure on baby's jaw and teeth as well as reduce the risk of tooth misalignment.   Extra-large openings in the shield provide maximum airflow and allow baby's sensitive skin to "breathe" Orthodontic nipple shape is asymmetrical with a scooped bottom: Flatter to allow for more room for natural sucking motion, slimmer to reduce pressure on jaw and teeth, and narrower to help prevent teeth misalignment Heart-shaped shield fits perfectly under baby's nose for easy breathing BPA-free - silicone nipples easily clean pacifiers in microwave with new NUK reusable storage case Available Size 0-6 / 6-18 months