OLDWICK, N.J.--(BUSINESS WIRE)--A.M. Best has downgraded the issuer credit rating (ICR) to “bbb” from “bbb+” and affirmed the financial strength rating of B++ (Good) of Western Dental Services, Inc. (WDS) (Orange, CA). The outlook for both ratings is stable. New Mountain Partners III, L.P., a private equity firm, is the ultimate parent organization of PDS HoldCo Inc. (PDSH). WDS is a wholly owned subsidiary of the holding company, Premier Dental Holdings, Inc. (PDH), which is owned by PDSH. The