When monitored, sure. The approach I would guess an OCD specialist would use (I’m not one, so this is only a guess) is to have the patient dry their hair, leave

When monitored, sure. The approach I would guess an OCD specialist would use (I’m not one, so this is only a guess) is to have the patient dry their hair, leave the bathroom, and wait as long as they can bear without checking to make sure they turned it off. Then, some time later, have them do it again, and try to wait longer. Repeat until they can go to work without worrying. Letting them take the hairdryer with them until they can do without it seems like a good addition to ensure they can get through the rest of the day.