It is a permanent front tooth. She is holding it in a tissue because that is what seemed sensible, her son is crying, and she is standing on the edge of a playground trying to work out who to call on a Saturday afternoon.
What happens in the next twenty minutes genuinely matters, and it is not primarily about who ends up treating him. It is about whether anybody tells her — quickly — how that tooth should be handled and where to take it, because the window for the best outcome is short and it is closing while she is deciding.
She rings her son's dentist. She gets a recorded message giving an emergency line, which she writes on the back of a receipt with one hand.
This is what makes paediatric dentistry different from the rest of this group, and it is why the phone matters here in a way that is not really commercial. The patient cannot call. The caller is a parent, usually mid-something, usually with other children present, and on the small number of calls that are genuine trauma the first sentence somebody says to her has a clinical consequence.
The rest of the time the same phone carries an entirely ordinary problem: parents trying to book two or three siblings into one visit, around a school day, without taking a day off work. That is a scheduling puzzle rather than an emergency, and it is the thing that most often does not get solved because nobody picked up during the twenty minutes a parent had free.
Both of those calls are lost the same way, and both matter more than a missed call in most businesses.