What Is The Best Option For A Dead Front Tooth?

I am assuming that this tooth has discolored and that is your reason for your restorative options.  I would say that after your evaluation by an endodontist it is probably not necessary for a root canal.  An all porcelain crown would be a great option for this situation for two reasons.  Aesthetically, your crown can be matched exactly to the other teeth around it.  Also, the crown will help protect your tooth against fracturing since the canal is calcified and there is no longer any blood supply to the tooth. Good luck.

If appearance is the only concern, then root canal therapy would not be needed.  If infection was present, then a procedure called apicoectomy can be done, or extract and place an implant.

I am going to assume that it was merely discolored.  Bleaching likely won't work, and internal bleaching should only be done if a root canal has been completed.  Even though the endodontist could not see a canal, it is likely there microscopically.  The LAST thing you should do is internal bleaching, where bleach and other strong chemicals are placed on the inside of the tooth.

The best approach would be a single veneer.  It is very challenging and may take an extra visit to "get it right", but a good cosmetic dentist should be able to do this very well.

Experience of a dentist is so important when it comes to matching a front tooth.  Find an American Academy of Cosmetic Dentist (AACD) dentist.  A root canaled tooth can easily be matched to your other teeth, but again, it's all in the hands of the dentist.  Either crown or veneer will be fine if the substructure of your tooth is solid.  If the root canaled tooth is all false material, then a crown is more likely to be protective than a veneers.  

As long as there is not an infection and it is confirmed that a root canal does not or cannot be performed; for cosmetic issues in which there is sufficient healthy tooth structure and no contraindications (ie. teeth grinding), veneers are a great option to help correct discolorations. Consult your doctor, in person, to find out specifically what your best options are. Sometimes it may be beneficial, cosmetically, to have more than just the single veneer placed. Have an amazing day and keep smiling!

Many times teeth can suffer from a traumatic injury and not have any symptoms. Over time, you may notice the tooth turning darker in color, yet have no pain or discomfort. If this has happened to you, chances are you injured your tooth many years earlier. As time goes on, the tooth slowly dies and gets darker. On a routine dental exam, your dentist may notice that the nerve from the tooth has receded and become calcified. What this means is that the tooth is now completely sealed off from the rest of your body. Without getting nourishment and its blood supply, the tooth progressively gets darker and darker. 
If the specialist doesn't feel you need a root canal, yet your tooth is still dark, I would recommend placing a porcelain veneer on the tooth. A veneer is a thin shell of porcelain that is permanently bonded to the front of your tooth that can mask the dark color. I would avoid placing a crown as it requires more tooth reduction and that can compromise the tooth's long term prognosis.