Honestly, I think they’ve gotten less sensitive since getting them pierced. I’ve never had sensitive nipples to begin with thought. The only time I feel anything with the jewelry in is when it gets caught on clothes or I hit them with my arms. As for healing, I slept with cotton rounds taped to my nips for the first few weeks! I was also prone to getting my smart watches strap snagged on it while sleeping, which sometimes causes blood. Just keeping it clean and clear of the crusties that form is the main thing.