OREANDA-NEWS. A.M. Best has upgraded the financial strength rating (FSR) to A (Excellent) from A- (Excellent), the issuer credit rating to “a” from “a-” and the Mexico National Scale Rating to “aaa.MX” from “aa+.MX” of Dentegra Seguros Dentales, S.A. (DSD) (Mexico) in tandem with its group’s rating upgrade. The outlook for each of these ratings has been revised to stable from positive.