When matching the upper front bridge to my natural teeth, should it match the lower front teeth in yellow undertones?

When restoring teeth the color of the porcelain is very important for the esthetics of your smile.  If the teeth you are matching are discolored, you could consider lightening them first.  Here is how you would do that:1)  When the front teeth are prepared for a bridge and a temporary is placed have it made in a color that looks pleasing to you.2.)  Have the back and lower teeth bleached for 4-5 weeks while you are wearing the temporary.  3).  When the bleaching is complete, see if the color is acceptable to you, then have the dentist select a porcelain color/shade that is pleasing with your smile in which the final bridge is made.  See which area is most visible with your smile, the upper back teeth or the lowers, or both.  Hopefully the dentist uses photography to show you this.  Then you can study the photos with the dentist and choose the final color.  If you are a younger patient, you may show more of your upper teeth in your smile.  Older patients show more of the lowers most of the time.