By now, dentists know by the look of them which patients are skulking in to get their first visit since the start of the pandemic over with. Some are self-conscious, others pre-emptively apologetic. Occasionally, patients are so flustered they have trouble even doing the "open wide" part: "They're like, 'Don't look at my mouth!'" says Warren Woodruff, a dentist in West Bloomfield, Mich.