My dental bridge does not match can it be fixed? (Photos)

I've got an all porcelain 2 unit bridge on my two front teeth that doesnt match my other teeth. It also seems to change in color when I drink coffee so I now I drink it through a straw. My dentist says it cant be fixed. Can it? and I thought porcelain wouldnt change colour with things like coffee. It also looks almost brown in dark lighting