Here at Dr.Openshaw’s office in Modesto CA we see patients with the very first tingling sensation and we use the latest technology with our dental laser to painlessly treat the area. Patients report reduced severity and also a reduced recurrence in the area that is lasered. A cold sore is uncomforatable at best and downright embarrassing. Plus they are contagious. When you notice that first tingle, call us to get in right away. (209) 524-4763.