Aurelio Escovar is introduced as a poor dentist without a degree. He is busy polishing false teeth early one morning when the mayor arrives to see him. At first he refuses to see this would-be patient, until the mayor, who has been suffering severe toothache for five days and is desperate, threatens to shoot him. Eventually the dentist lets him in, examines him, and then removes the infected wisdom tooth, without anesthesia.
We realize that the dentist has deliberately made the mayor suffer all this time, and he gives the reason as he pulls out the tooth, saying "Now you’ll pay for our twenty dead men." When the mayor has recovered and wiped his tears, he leaves, telling the dentist to send the bill. When Escovar asks whether to send the bill "To you or the town?," the mayor replies, "It’s the same damn thing."