Is there a relationship between methahemoglobinemia & dental work?

Yes: Your dentist need to avoid the local anesthetics Benzocaine and prolcaine. These local anesthetics can trigger a state of low oxygen in patients with methemoglobinemia. Patients will be unresponsive to oxygen and Methylene Blue will be required.

Yes but rare: Methemoglobinemia can occur as a side effect to the use of topical anesthetics in dentistry. The numbing gel dentists use contains Benzocaine which can cause this condition. It is more like to happen in small children, especially under 2. For this reason, dentists need to be careful with the administration of topical numbing gels.