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Or the use of teeth in fiction.
Most of the time, you get Hollywood Teeth- everybody has lovely straight pearly whites, even where this is unlikely (more on the lack of orthodontics front than access to sweets).
This is occasionally subverted for realism's sake: in the Broadway version of Les MisÚrables, the characters have horrible teeth, which makes sense since most of them are, well, poor.
However, teeth can have other connotations.
Missing teeth can be seen on roguish or villainous sort of characters, like Fagin.
Or, conversely, on cute little kids who are losing their baby teeth.