Not IV, but does Esther's dentist, cousin of her plastic surgeon, appear

[Mark Kohut]

in "The Long Goodbye", so to kutely speak?

Chapter 15, p. 80 (hc copy): 

"Then we have Dr. Lester Vukanich. Ear, Nose, Throat,
Stockwell Building, on Hollywood Boulevard. This one's
a dilly. Office practice mostly, and seems to specialize
in chronic sinus infections. Rather a neat routine. You
go in and complain of a sinus headache and he washes out
your autrums for you. First of course he has to anesthetize
with Novocain. But if he likes your looks it don't have
to be Novocain, Catch?"