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.
Trays can be used solely for at home whitening. They can be used for a boost or maintenance following in office zoom. Additionally we use them as a means to Optimize in office Zoom results. I have my patients who are willing to put in the extra time and expense for whiter longer lasting teeth...
If you have several cracked teeth and several cavities, in that case a holding care should be performd first. Meaning the decay needs to be removed and then restored temporarly. Getting the whitening done on the teeth with cavities and or cracks can cause sensitivity which can be severe...