Advantages after you already did the crowns teeth can be lightened or whitened to any desired shade, the dentist can improve shapes of teeth during this process, some realignment or straightening of teeth is possible longest life of any restoration.
Disavantages is crowns can fracture , requires an anesthetic. Original tooth form is altered (possibly involving the nerve) . If tissue shrinkage occurs, it can expose the junction between tooth and crown, allowing for the possibility of an unsightly line. Crowning is not permanent , there is limited esthetic life expectancy (but if you keep clean well take care of it, no infection the crowns can last you more than 10 years this is what is my experience)
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