It all depends on the shade of both your fillings and your own teeth. Your own teeth will get whiter and your fillings wont. So if that will make them match better then move forward. If you own teeth get whiter than your fillings then you can have them re surfaced to match your newly whitened teeth.
Make sure your bonded fillings do not have gross decay. Then Zoom your teeth, and after wards after 3-5 days replace the fillings. Ask your dentist to make some touch up home care kits to maintain your whitened teeth.