another relevant comparison is why it's OK for you to get irradiated by the xray machine but the technician goes and hides behind the wall. you're getting it done once today, the technician is doing it 50 times a day 3-5 days a week (or more depending on cost of living in the area 😉). You'll notice a lot of those nail techs and dental professionals are also wearing respirators while applying product to their clients and patients. wear your ppe.