You have questions, we have answers! Feel free to contact Delta Dental of Oklahoma’s friendly Customer Service Department. Call Us: 800-522-0188 (Toll Free) -or- 405-607-2100 (OKC Metro). E-mail Us: customerservice@DeltaDentalOK.org Write Us: Delta Dental of Oklahoma Attn: Customer Service Department P.O. Box 54709 Oklahoma City, OK 73154-1709