Guy Gardener wrote:
It's possible that the Doctor (in the beginning with basic factory settings.) may not have been able to initiate anything to do with Pon far, which if that was programmed badly enough as some politically correct protocol to spare the Vulcans any shame or embarrassment, he may not have even been able to think about Pon Far or be aware that it exists until a patient "asks" for help.
Thinking is not singing.
I notice he did not use the same tactic he used on Zimmerman to heal his patient. Disguising himself as an alien masseuse (Lifeline).