Elie manages to save his gold crown in Chapter Four of Night by feigning illness. After being forced to go to a medical checkup which is followed by a mandatory visit to the dentist, Elie realizes that this appointment is a smokescreen. The dentist is not checking teeth for decay, but rather to see if there are any gold fillings that can be removed.
Once he figures out that his tooth is going to be extracted, Elie quickly devises a plan to escape this fate. He tells his dentist that he has a fever and doesn't feel well, and he requests that the extraction be postponed a few days. The dentist agrees, but orders him to return when he feels better. Elie recycles this excuse when he has to return, buying himself just enough time. The dentist office is closed shortly thereafter, and the dentist himself is sentenced to hang.