rarer than hens' teeth

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rarer than hens' teeth

Incredibly scarce or rare; extremely difficult or impossible to find. Support for the president is rarer than hens' teeth in this part of the country.
See also: teeth
References in periodicals archive ?
The first was the fact her dad was a Conservative - they were rarer than a hen's tooth in Liverpool in the 70s.
I was surprised to read Esther McVey's dad was a Tory - they were rarer than a hen's tooth in Liverpool in the 1970s'