

What is this bluish thing on my teeth?
It’s on the 2nd to back on both sides of my mouth. I’ve never noticed it until today since I got curious how the bleeding was looking (I ate something super spicey and felt a bit of pain, nothing too bad) and I noticed these. I’ve never had a cavity before and I always brush my teeth, this isn’t painful and my last checkup, the dentist didn’t say anything (few months ago). I’ve had braces before and I’m not sure what they do at my checkups but they do sometimes put extra pastes on but not sure. Any advice would be helpful!