Prosthrodontist said that composite resin discolors and will chip off if placed on tooth roots when trying to fill in gray triangles.need 2nd opinion?

Second opinion: In many cases, seeking a second opinion is not only warranted, but necessary. Unless your disease is life threatening and requires emergency care, it is never a bad idea to seek a second opinion. Getting a second opinion helps you feel more confident about your diagnosis and treatment plan.

It's true!: Composite will discolor, and since it will not be placed into a cavity, but rather stuck onto the surface of the tooth, it can debond. By changing the emergence profile of the tooth, your teeth will also look "bigger". Nevermind the food and bacterial trap that may exacerbate your perio problems. If you are willing to accept all of the above, discuss the matter further with your prosthodontist.