I’ve been nicked by teeth on several occasions because my girth is typically an issue. It’s been rare for me to find a partner who doesn’t nick me, so it has made me reluctant to ask for or accept a blowjob. I reached a point where I would mentally assess a woman’s jaw before agreeing to let her try to give me a blowjob. Recovering from being nicked can take days. I certainly feel for you from the giver’s side. No one wants to hear they hurt their partner.