Wow! First time I’ve ever read or heard that. Would you provide your source on this please. Thank you.
It’s a report from the Columbia University College of Dental Medicine.
http://www.colgate.com/app/CP/US/EN/OC/Information/Articles/Oral-and-Dental-Health-Basics/Common-Concerns/Canker-Sores-Cold-Sores-Infections/article/Cold-Sores-and-Fever-Blisters.cvsp