My problem with my darker tooth under the veneers really bothered me, my dentist went in under the veneer and removed a good part of the tooth and replaced it with a white composite filling. The tooth looks better but feels strange and is sensitive at the gum line. I'm wondering if I ever need a replacement veneer will this be possible with part of my tooth gone? I really wish I would have tried internal bleaching as a first option. Is this a common solution to my problem? I am looking for comfort.