Dr. J. M. Eager reported the occurrence of brownish colored stains among majority of the residents in Naples which was termed as-

In  1912,  McKay  found  an  article  written  by Dr. J. M. Eager in 1902  reporting the unusual occurrence  of  brownish  colored  stains among majority of the residents in Naples. Eager  had  termed  these  brownish discolorations as  "denti di chiaie".