No
This is not an idiom, so it means what it says. Something is as rare or hard to find as teeth on a female chicken (or any chicken) - chickens are birds, and do not have teeth.
your two back teeth
I guess as long as they have teeth.
No, teeth are bones.
Regular teeth
yellow teeth
Yeah because the enamel of the bone covers the teeth in thick protective coats on top of teeth
Enamel is what makes your teeth thick. If you teeth looks transparent on the bottom then your enamel level there is low. Enamel is eaten away by acid found in fruit. Once you lose your enamel it is gone forever. To protect you teeth from acid then use a specialized tooth paste to protect you teeth
i don't think so
Corn,candy,meat and chicken
For as long as a chicken has teeth.