Ceramic composites not carbon fiber. I have 2 ceramic composite crowns on my upper incisors and 2 ceramic composite veneers on my upper bicuspids. I broke my upper incisors when I was ten and have replaced the crowns twice. Most recently I replaced them after whitening the other teeth in my mouth so I could have the crowns made much whiter. I had the bicuspids veneered so I could match all four teeth and eliminate visible tetracycline staining that can't be bleached out. The ceramics are actually stronger than the original teeth, and they wear down less than real teeth.
I am sorry it was wasted.