The Smile4Life program was developed in Cumbria and Lancashire to address poor dental health in children. The program focused on sustained behavior change supported across health and social care systems, using evidence-based guidance. A key strategy for implementing Smile4Life was developing the workforce, including training 267 Oral Health Champions in children's centers and early years settings, and 54 dental nurses in rural Cumbria in prevention and fluoride varnish application. This workforce training approach helped Smile4Life successfully reach over 85,000 children aged 0-5 years old and their families.