Attention: Nipple Corrector Device Correction for Inverted Nipples Treatment Enlarger Nipple Shield Breastfeeding with Carry Case Using for Protects Sore Cracked Nipples Flat Inverted and Latch On Difficulties to Help Mums Continue Breastfeeding 1.According to the degree of invagination and the frequency of correction, it generally lasts about 2-3 months to achieve relatively satisfactory results. 2.3 hours a day. If the suction is not enough, you can apply some skin cream around the nipple to increase the suction of the appliance