My crown is darkening after 6 months, dentist says its cause my tooth under is dark...true? i had two front teeth performed at same time. one is fine

Unaesthetic Crown: Good day; Truly require additional information before answering your question. Margin of the crown may not fit tooth. Prepared tooth may be darkening due dying nerve. Contact a dentist and permit reexamination of unaesthetic crown.

More Info Needed...: Porcelain fused to metal or porcelain jacket crowns? Did the teeth have prior root canal therapy? This problem requires a physical examination... you may need a second opinion from another local dentist, one that can actually examine you.