A large health insurer is forming an alliance to expand its dental plan menu.

Principal Financial Group Inc., Des Moines, Iowa, says it has agreed to work with a unit of SafeGuard Health Plans Inc., Aliso Viejo, Calif., to offer 2-option dental plans to employers in California, Florida and Texas.

Employers who adopt the program will be able to offer a dental health maintenance organization plan alongside a dental preferred provider organization plan, Principal says.