You can tell the age of a sheep by its teeth. People are more complicated. More about people later.
If you hear someone using the word “tooth” as a transitive verb, chances are they’re talking about “toothing” an animal to determine its age. Maybe a ewe. Or maybe a cow. Or some other species.
Chances are you won’t find the verb form of tooth in print—not on the Internet. I searched online in vain fo…