After a few days, a hairdryer can be used without heat and on a low setting and, of course, care must be taken not to damage the follicles. Toward the end of the first week, once the grafts have healed up nearly 100%, normal blow drying can resume, again, with little or no heat. Please contact your doctor or nurse specifically to find out exactly when they feel in your specific case you would be ready to continue using a hairdryer or blow dryer.