Why does my crown keep on chipping and cracking on one side?

From your photo , it appears you are concerned about the left front incisor.  How long has the area appeared darker?  Is the right one also crowned? Unfortunately any gum colored restoration would effect the integrity of the margin of the existing crown and would basically be a drilled...

Your new dentist sounds very competent . I agree that a zirconia abutment would not be my choice for #7.  How your teeth come together in the front  is critical to decide which material to use.Do you bite very hard? How much room is there for the abutment and crown? What shade are you...

Diagnostic waxups aren't required to do great dentistry, but they are immensely helpful. I usually tell patients that a diagnostic waxup is like a blueprint for how we want your final restorations to be fabricated. You wouldn't consider building a house without a blueprint, nor do I remove tooth...

Since the tooth/crown has been fine for 10-12 years, this likely indicates that the tooth/root is fractured or that the tooth is reabscessed. See your dentist right away to have xrays done and the tooth evaluated .

Gums tend to regrow around implants when abutments and crowns are removed....to a point and in limited amounts. It really depends. You need to consult a periodontist who specializes in gums and he or she will tell you what should be done long term 

From the photo, the crown doesn't look too bad but if it is at all bigger than your original tooth, which may have been compromised because of wear,breakage,filling,etc, it will feel big to you. . The crown may be going a little deeper under your gums in order to extend beyond the filling for a...