First of all, it hinders the beauty and affects breastfeeding. Second, because of the nipple depression, the nipple is often forced to pull out when breastfeeding, when the nipple is very delicate, once the collision, it is easy to damage, rupture and bleeding, which can cause nipple and even the whole breast infection, and eventually mastitis. Third, the nipple is a very important sexual sensitivity point for women, and many women’s sexual desire is stimulated through the nipple to achieve. Once the nipple is sunken, it is difficult to play effective sexual stimulation, and even affect the male partner’s sexual desire.