Preventing early childhood caries (ECC) requires improving parental knowledge and behavior, as parents play a critical role in establishing oral and dental health practices during early childhood. This study aimed to evaluate the effectiveness of a parent-focused educational intervention, delivered within the nursing discipline and grounded in King's Theory of Goal Attainment, in preventing ECC. A pretest-posttest randomized controlled experimental design was employed. The study was conducted with 100 parents of children aged 0-3 years who presented for treatment at the Department of Pediatric Dentistry. Parents in the intervention group received ECC-prevention education supported by booklets, brochures, and videos.