Abstract Issue/Problem Two key public health issues at present are mental health problems and obesity. Both typically begin before adulthood and once occurred, typically persist. Prevention would be important but also economically and humanely sensible. For this, competent experts in preventive work and health promotion are needed. Description of the problem Public health nurse education, originally known as health sister education, was initiated in Finland in 1924, by the Mannerheim League for Child Welfare. The six-month health sister education was targeted at nurses and began from the desire to focus not only on treating diseases but also on promoting health. In the 1940s, education was reformed and in the 1950s significantly expanded. In the 1970s, the professional title changed from ‘health sister’ to ‘public health nurse’. In 1987, the education was extended to 3 years, including the education of registered nurses. In 1992, the education was further extended to 3.5 years. By the beginning of the 21st century, education evolved into 4 years bachelor’s degree. Results In 2024, eighteen Universities of Applied Sciences provide public health nurse education in Finland. The 4-year Bachelor of Health Care in Public Health Nursing -degree (240 ECTS credits) also qualifies for a registered nurse. Nearly half of the education consists of clinical training. In addition, registered nurses can supplement their degrees by completing a one-year education (60 ECTS credits) that qualifies them as public health nurses. Lessons In Finland, approximately 700 new public health nurses graduate annually. They are trained to work independently as experts in preventive work, health promotion, and public health. Around 9,500 Finnish public health nurses work in settings such as maternity and child health clinics, school health services, occupational health care, and outpatient clinics. Key messages • Due to the overcrowding in many healthcare services providing treatment, educating experts in health promotion and disease prevention is crucial now and in the future. • By ensuring competent experts in health promotion and disease prevention, future healthcare services can continue to provide economically and humanely sensible and effective help for people.