Boyfriend says we shouldn’t tongue kiss and I have to keep up on my brushing.

Hi guys! An hour ago my bf texted me saying he feels like we shouldn’t tongue kiss and that I need to keep up on my brushing. Should I take this offensive or what? I think I might try to make a dentist appt tomorrow. How would you guys feel if your significant other said that to you? He texted me this while I was at work and ever since then I been in my feelings 😩 has your bf ever told you this before?