I do not know how to add lyrics to digitrad. The songbook "Too Many Songs by Tom Lehrer" has the following lyric which Tom Lehrer added to the song for the 1980 revue TOMFOOLERY, following the line "...lose the ability". The intent was to change the song into a quartet, where first the woman sings some of the lines to the guy who has just insulted her, and then a male couple enters, and the older guy sings part to the younger. All 4 sing the "Your teeth..." closing.

While enjoying our compatibility,
I am cognisant of its fragility,
And I question the advisability
Of relying on its durability.
You're aware of my inflexibility
And my quintessential volatility
And the total inconceivability
Of my showing genuine humility.
Though your undeniable nubility
May excuse a certain puerility,
Your alleged indispensability
Underestimates my versatility,
And your boyish irresponsibility
And what now is charming juvenility
Will in time lose its adorability
And appear much more like imbecility.