NUK® Med Flow Silicone Orthodontic Nipples. 0+ m. 2 wide neck silicone nipples. Brand trusted by moms for over 25 years in North America. Reduces colic. BPA free. NUK® Air System™. Simulates and supports breastfeeding. Vented nipple - reduces colic. Orthodontic nipple promotes healthy teeth formation. Fits all NUK® wide neck bottles. Try Nuk® pacifiers with orthodontic nipples. NUK is a registered trademark of MAPA GmbH, Zeven, Germany. 2010. All rights reserved.