Naturally yellow teeth, sensitivity. Would bonding help the color and sensitivity?

Great questions--lets talk about the sensitivity first--If there is exposed dentin or root surface then if the area can be covered with the bonded composite then the sensitivity would usually be lessened. Sometimes people clench or grind their teeth causing sensitivity and until this is controled the sensitivity may continue.As far as bonded composite brightening your smile and reducing the need for reshaping the teeth--this may be possible--if the teeth are quite discolored then the teeth may need to be reshaped to allow for an adequate thickness of opaquers and composite to brighten the teeth and still have nicely shaped teeth. Sometimes no preparation porcelain veneers are an option as well. A trained cosmetic dentist can offer you all of these options. Good Luck!