What does the narrator mean by the
lady having more teeth
than necessary? What
practical purpose does
he refer to?

To have more teeth would mean to have the power to enforce something, like a rule, a law or regulation

what is the question?

comfortable

explanation:

one type of the adjectives is predicate adjective. a predicate adjective is an adjective which follows a linking verb and modifies or refers back to the main subject of that linking verb.

it usually is used just before the noun it modies.

here in this example:

'penguins seem comfortable in the coolest habitats', comfortable is the predicate adjective which follows the linking verb 'seem' and modifies the noun.