auntypebbles,
I would suggest that the sensation is your salivary glands trying to produce saliva. When you smell and taste your brain activates the salivary glands to produce saliva. Sour tastes like lemon are the most powerful stimulators of saliva glands. In front of your ears and in your cheeks lie the largest salivary glands the Parotid glands.
I would suggest that this tingling sensation is a very positive indicator that your parotid glands are trying to regenerate some of their saliva producing ability.
I hope this is helpful,
Mike