However, the best practice in terms of using nipple shields for breastfeeding is - consult a lactation first and follow his / her guideline to make sure you are on the right track. (welcomeparenthood.com)
Only use a nipple shield with the recommendation and observation of a lactation consultant. (motherandchildhealth.com)
Sometimes (after six weeks of using nipple shields in my case) it goes away; sometimes it doesn't. (skepticalob.com)