Dental and oral therapists provide health services to adolescents in the Soppeng Regency area in the implementation of planning management, especially in posyandu, which is still manual and has not been implemented properly. The Posyandu Management Information System (SIMYANDU) is an information system that can overcome problems and improve the managerial skills of dental and oral therapists. This study uses the Research and Development (R&D) method, model testing using the pre-experimental design method. The data from the model test results were tested using Aiken's V and Intraclass Correlation Coefficient (ICC). The results of the expert validation test on SIMYANDU obtained an average feasibility score of 100% which means it is feasible as a posyandu management information system based on expert validation (v=0.68), ICC value (p=0.940). Assessment of the managerial ability of dental and oral therapists after treatment is meaningful. The results of the effect size test on the aspects of problem identification (p=0.001), problem priority (p=0.001), cause of problem (p=0.003), alternative solution to the problem (p=0.001), planning (p=0.001) means that the web-based SIMYANDU model to improve the managerial ability of dental and oral therapists is very effective in adolescent health services in the Soppeng Regency area. This study shows that the application of the web-based SIMYANDU model is feasible and its application is effective in improving the managerial ability of dental and oral therapists in health services for adolescents in the Soppeng Regency area.