The dentist’s drill is screeching, your mouth is filling with saliva and you can’t swallow. A lot of people have felt panic at a moment like this. Some, however, are afraid of doctors in general, suffering from what’s known as iatrophobia. If you can relate, then it may help to know that the time of day is decisive for how much pain you are likely to perceive. Dentist Jochen H. Schmidt’s advice to anyone reluctant to come for a checkup or longer procedure: come in the afternoon, because at this time of day patients feel less pain caused by injections and drilling. This is due to pain-inhibitin…