Preventive fluoride treatment is a professional dental care method that involves applying a high concentration of fluoride to the tooth surface. This strengthens enamel, prevents cavities, and repairs early tooth damage. Fluoride forms a protective layer with enamel, reducing acid erosion from bacteria. Suitable for children, adolescents, and those at higher risk of tooth decay, it is recommended every 6 to 12 months. In overseas outreach clinics, fluoride treatments effectively help local residents prevent dental problems, improve oral health, and reduce the incidence of cavities.