B Background: The premature loss is a state where the primary teeth has loss before the eruption time permanent teeth. Premature loss can affect the jaw's elongation so the space for permanent teeth eruption will not be enough. This insufficient space can cause occlusion development like rotation, crowding, mesial drifting that also known as malocclusion. Premature loss has several different malocclusion, it is depend on what kind of teeth loss, hence, it is often be the ortodontic patients complain at RSGM FKG Trisakti University. Purpose: to provide the premature loss of primary teeth on the orthodonthic patients at RSGM FKG Trisakti Univeristy from 2013 to 2015. Method: observational research using the secondary data which are medical records and study model from year 2013 to 2015 with these following as the parameter: age, the kind of teeth loss, molar connection and the entire teeth condition. Result: there are 52 sample experiencing premature loss with the age gap between 6 to 10 years old. 2 patient (3.8%) at the age of 6 year old group, 13 patient (25%) at the age of 7, 19 patient (36,5%) at the age of 8, 11 patient (21.2%) at the age of 9, and 7 patient (13.5%) at the age of 10. Total teeth has premature loss history is 80 teeth with 17 teeth (21.25%) at the first insisivus, 24 teeth (30%) at the second insisivus, 9 teeth canines (1.25%), 10 teeth (12,5%) at the first molar and 20 teeth (25%) at the second molar. Conclusion: prevalence of premature loss of primary teeth on the orthodontic patients at RSGM FKG Trisakti Univeristy is 18.5%