rare/scarce as hen's teeth

*scarce as hen's teeth

 and scarcer than hen's teeth
Cliché scarce; seldom found. (*Also: as ~.) I do declare, decent people are as scarce as hen's teeth in these chaotic times. Handmade lace is scarcer than hen's teeth; most lace is made by machine.
See also: scarce, teeth

scarce as hen's teeth

Also, scarcer than hen's teeth. Exceptionally rare, as in On a rainy night, taxis are as scarce as hen's teeth. Since hens have no teeth, this term in effect says that something is so scarce as to be nonexistent. [Mid-1800s]
See also: scarce, teeth

rare as hen's teeth

or

scarce as hen's teeth

OLD-FASHIONED
If something is as rare as hen's teeth or as scarce as hen's teeth, it is extremely rare. Record companies are becoming as rare as hen's teeth. Note: Hens do not have teeth.
See also: rare, teeth

rare (or scarce) as hen's teeth

extremely rare.
As hens do not possess teeth, the implication is that something is rare to the point of non-existence. The phrase was originally a US colloquialism, dating from the mid 19th century.
See also: rare, teeth

(as) rare/scarce as hen’s ˈteeth

(old-fashioned) extremely rare: Critics always complain that good movies that the whole family can see together are as scarce as hen’s teeth.
This refers to the fact that hens do not have teeth.
See also: rare, scarce, teeth

scarce as hen's teeth

Nonexistent. Hens have no teeth, so what could possibly be scarcer? (Stones in their gizzards act as teeth to grind their food).
See also: scarce, teeth