The best and most permanent treatment for nipple deformities is nipple correction surgery.

Inverted Nipple Surgery: Procedures, Recovery & Side Effect

An inverted nipple is harmless, but it may interfere with your breastfeeding, lower your self-confidence, and impact your sexual activity. Based on the grade of nipple inversion, the doctor suggests using Hoffman's technique, suction devices, nipple piercings, or getting cosmetic surgery. Although nipple surgery fully restores the nipples, it might harm all or some of the milk ducts.