Is It Possible to Bond the Upper Part of Top Teeth That Have Been Exposed and Are Yellowed by Receding Gums?

Receding gums are often seen and the result is the yellow tooth structure underneath!  Bonding is probably the most common way of repairing hte situation.  A tooth colored bonding material can be placed to cover the recession and with proper tooth care can also help to reduce the future recession.  It should look very natural and esthetic when complete.  As well, it is far cheaper than a veneer or crown. 

Yes, you can use bonded restorations to cover exposed and yellowed area of the teeth next to gum line due to gum recession but sometimes It is better to cover that area with gum graft (gingival graft).

Yes, it is entirely possible to cosmetically improve the appearance of teeth affected by receding gums.  How this is accomplished may depend on your particular situation. The most common way is to bond some white filling (composite) to the area.  Another way is to provide some gum grafting.  Whether a whitening system can be used is also another consideration . Yes, there are ways to improve the appearance.

Allow your dentist to assist you in the best choice.