Filling transparent, darker spot on tooth? (Photo)

Hi! I just god a non vital bleaching done, I'm pretty happy with the result but since then I realized that the new filling is kind of transparent. As a result, the middle of the tooth appear a bit darker as it doesn't reflect the light as much as the other teeth. I included a picture (the best I could do, with a flash light in my mouth to amplify the difference), see the white spot in the left tooth. I know there are different kinds of fillings, would one work better to fix that translucency? Thanks!