Old Bonding Has Discolored. Can This Be Retouched Up Without Drilling?

In many cases it is possible to repair old bonding without numbing the patient, but slight "drilling" would be necessary.   Your dentist can remove a small portion of the existing bonding making room for the new bonding.  Though this process is many time not invasive, it seems that you may have slight dental anxiety.  You may be a great candidate for oral sedation.  You would take a pill the morning of the appointment (approximately one hour prior to the procedure).  By the time of the scheduled appointment you would be very relaxed and possibly even sleeping.  I think this would be a great option  if you cannot take dental anesthesia.  Good luck.

One of the great benefits to dental restorations is stability.  Despite what I do or eat, they remain mostly unaffected.  This can be a problem when we WANT a change.  Products like the Supersmile® you mention are only designed to change color of tooth structure and not your dental bonding.

Sometimes bonding can discolor superficially.  This means if the outer layer is polished, the color can improve.  However, quite often dental bonding has changed color throughout the material and surface polishing does very little.

Without seeing your situation I can only guess what would be best.  Normally, completely redoing is the only answer.  Porcelain veneers are usually the next step, as they are more color stable and durable.

I understand your concern.  This can be done without getting numb, but you may not get the esthetic results you desire, especially if the current bonding is much darker/yellow and there will be a big discrepancy.  Reason being is that the new layer of composite would probably be extremely thin, and the preexisting bonding may show through.  An opaque composite can be used to help block out the underlying layer, but it may not look as natural.  I would recommend for your dentist to gently and minimally "roughen" up the bonding with a bur on a drill, air abrade the composite with Aluminum Oxide, phosphoric acid etch, good adhesive and finally composite.  I will emphasize doing this in a dry field with no saliva contacting the teeth.  Air abrasion, phosphoric acid, and a good curing light to polymerize the composite are key components to successfully bond composite to composite.  It's worth a try, you have nothing to lose.   Unfortunately no whiteners can be used on bonding, it will not change color.  Hope this helps, good luck!