Were you tested for latex allergy after you had the reaction?

I think novocaine (or whatever they really use... I think it's lidocaine?) can be allergenic too?

Is it possible you reacted to a food or something else outside the dentist's office?

Most HCPs that I'm aware of have already gone to nitrile gloves. If your experience spurs your dentist to do that, then that's good even if it's not what you reacted to.