How to correct uneven color on teeth after a gingevectomy? (photo)

I got a gingevectomy in order to expose more of my teeth. My teeth were really small in appearance so my dentist raised my gun line. Unfortunately, the tooth that was previously below the gum is more yellow, probably due to whitening before the gumline was raised. Is there a way to even this out? (As for the translucentness on my bottom teeth, they have been that way for as long as I can rememeber) I do not want veneers.