Oral hygiene is an important step in the control of the biofilm, a factor related to diseases such as gingivitis and tooth decay. The systematization of oral hygiene in children is a set of measures that seeks to achieve sequential learning, thus guaranteeing a better elimination of the biofilm. Objetive: To show a sequence of systematized steps in oral hygiene in a pediatric patient with a definitely positive behavior. Case Report: Six year old female patient, without relevant medical history. On clinical intraoral examination presented biofilm accumulation and swollen gums. The presumptive diagnosis was marginal gingivitis associated with biofilm, the treatment included a preventive phase with motivation and education. The control of the disease evolution was carried out with a card of Systematization Technique of Oral Hygiene, the methodology included the recording of the educational sessions using videos and photographs. Results: the adequate use of the amount of toothpaste was achieved, the integrity was improved to 100%, the brushing time increased from 24 to 120 seconds and it was possible to add tongue brushing and not rinsing after brushing within the oral hygiene routine. Conclusion: The patient was able to clean all dental surfaces, using homogeneous times for each surface, following an orderly sequence in toothbrushing, as well as to acquire knowledge regarding the amount of toothpaste to use, tongue brushing and not rinsing after toothbrushing. The systematization of oral hygiene allowed us to achieve these achievements in six sessions.