Received half a Syringe of Restylane (0.4cc) to treat both tear trough areas...Not sure if it was enough

It is
possible that you had swelling under your eyes and that is why you thought it
looked great for the “first few days” but .2cc is a very small and does not
give very much improvement.

In my office
I typically start off by injecting 1 cc of Restylane .5 and .5 into each tear
trough. 2 weeks later I have my patient come back in for a follow up and we
decide if they want or need additional filler at that time.

It is best
to consult with a Board Certified Dermatologist with plenty of experience
injecting under eye hollows.

Restylane for tear troughs is a wonderful tool.  It sounds like you just need a little bit more Restylane injected into the area for a full result.  I would suggest you return to your treating physician to correct the tear trough area.