Best method / procedure to whiten teeth with no enamel, & dentin showing?

You can attempt to whiten your dentin first. A little may improve but not enough will make you satisfied for long term. Lumineers veneers without prepping your tooth away more will be best option to achieve that brightness and to protect your teeth.

If you are not able to whiten your teeth via a whitening procedure at a dental office, then porcelain veneers would be the best way to go.  Composite veneers can also help, they are generally less expensive, but don't look as natural and don't last as long.  It's hard to be able to tell you if you would be able to whiten your teeth or not without having seeing you for an exam.  It's best to talk to your dentist about your options.  Additionally, if you do decide to go down the path of having cosmetic work done, make sure you do your research and find a dentist that is very experienced in completing cosmetic procedures.  Make sure to look at before and after photos as well.   if you have any more questions, you can find me on instagram as well (@DrYazdan)

If you don't have enamel, the tooth won't whiten well. At that point you need to discuss veneers or possibly full coverage crowns with your doctor.