Dr Frank Jerome DDS says that crowns are never necessary except to pay for the dentist's Mercedes and mortgage. Dentists attend seminars on how to sell their patients crowns.Inlays and onlays are better. Crowns cause bacterial build up, gum recession, and filing down a tooth for a crown is much more traumatic to the nerve than placing a filling causing many teeth to die that day or in a few years ,allowing dentists further profit from root canals implants etc.
Frank Jerome wrote a book called "Tooth Truth "which deals wth hg and crowns.