Bonding discolored after 7 days. Why did it happen so quickly, and what can I do to make them white again?

Look through the "Bonding" category and see how many complaints there are.  That is why we practically always do bonded porcelain.  Wont chip or stain in most cases and will outlast bonding.

Usually the first couple of weeks are very important after bonding and you should be mindful of any foods that might discolor or stain the teeth. You need to use a straw for drinks such as coffee and tea  that cause staining  Also foods such as cranberries, pomegranates, blueberries etc. will stain as well.  Your dentist can polish the top bonds and if you used the same shade on the upper and lower teeth, polishing may take care of the problem. Also you might have had a little darker color on the top to begin with and that is why there is a contrast now between the upper and lower. If that was the case, the dentist should have taken this into consideration and used a lighter color on the top.  Try polishing and see what happens!  

"Bonding" or fillings on the front teeth do have the tendency to fade and stain. It is vey important after the dentist does the bonding that you avoid activities that could cause staining in the first 24 hours. No drinking dark liquids, eating foods that could stain, smoking, etc. After the first 24 hours the staining can still occur but not as dramatically. Unfortunately, it is difficult to whiten the bonding after it has stained. it is possible the dentist could polish them which may help a little or else the bonding would have to completely be done over.