According to Delta Dental, the company was founded in 1966 by dental service organizations working in California, Washington and Oregon. The goal of the company is to advance oral health care through dental benefits programs and philanthropic efforts. As of 2015, Delta Dental works with 39 independent member companies.
Delta Dental states that the 1967 partnership between Washington Dental Service and the International Association of Machinists formed the first multi-state dental benefits program, which gave Delta Dental the chance to expand its client base. Since then, Delta Dental has gained customers in all 50 states plus Washington D.C. and Puerto Rico. Delta Dental offered dental benefits to nearly 60 million customers in 2014.