Can I have my teeth rebonded? (photos)

Of course you can rebond your teeth provided that the existing bonding is composite resin, and the appropriate technique is used.  Even if the bonding happened to be porcelain, you can still bond composite to that as well.  Keep in mind however that the tooth you mentioned on the side that has a cavity may possibly need a more extensive restoration such as a porcelain veneer or a crown depending on the extent and depth of the cavity.  An xray will help give your dentist a better idea, but sometimes this cannot be determined until the bonding and decay is cleaned out and there is direct visual access.  In regards to technique, I would highly suggest to have your dentist roughen and remove a minimal amount of the outer extent of the current bonding with a bur/drill, in order to accommodate for thickness of new layer of composite and help mask out the existing stain and color.  Then directly air abrade with Aluminum Oxide and apply phosphoric acid etch.  This will significantly enhance the strength of the bond between composite and composite.  Also depending on the extent of the stain and underlying color of your current bonding, you may not achieve the esthetics you desire due to that showing through the new composite.  I would suggest in that case to have your dentist use a thin layer of an "opaquer" to block out the color, after priming and before adding the final layer of composite.  Hope this helps, good luck!  

Yes, you can definitely re-bond the front 6 teeth.  Although, as your dentist mentioned, veneers would be a more permanent solution with a more predictable result.

Yes, absolutely but if you bond 8 or 10 your smile would be even better! Your decision for 8 or 10 would depend on the extent of your smile.

You can definitely have all 6 rebounded at once. Bonding only 2 teeth will make it difficult to match the color exactly. If your dentist isn't comfortable doing bonding you might get a second opinion.

You certainly can rebond all 6 of your front teeth after you whiten your teeth to the color you want. Understand that the teeth underneath the bonding are not going to be affected by the whitening gel so you may not be able to get the rebonded teeth as white as your natural teeth. It's just something to be aware of. I would talk to your dentist again to find out what is different about the bonding on the teeth and why all of them can't be redone. There must be a good explanation for that and you just need to sit down with her and find out what she is talking about and what can be done to take care of the 6 front teeth.God luck