Objective: To evaluate the effects of bruxism on school success of 7-12-years-old children Research design: Case control study. Clinical setting: In Karadeniz Technical University, Faculty of Dentistry, Paediatric Dental Clinic from February 1st, 2011 to February 1st, 2012. Participants: The study was conducted on 7-12 years old children diagnosed with bruxism by a dentist. During research period 62 children were diagnosed with bruxism, but 53 children completed the study. Interventions: Children with no bruxism problem were chosen for the control group depending on their age-related characteristics. In order to collect data, the researchers designed a survey that contains 22 questions and report cards of previous semesters were brought by families to be used in this study. Main outcome: To evaluate the effects of bruxism on school success of 7-12-years-old children Results: There were no significant differences in demographic characteristics of case and control group except for birth type (X2=8.285 p<0.05). There were statistically significant differences (p<0.05) in pacifier usage (X2=10.63), eating disorder (X2=6.07), sleeping time in different rooms (X2=17.0), class level (X2=8.256), night waking (X2=10.63), halitosis (X2=6.11), nail biting habit (X2=16.83), pencil biting (X2=53.59), mouth breathing during sleep (X2=33.56), snoring (X2=31.62), lip biting (X2=28.94), and enuresis nocturne (X2=33.56). Comparison of class and behaviour on school success shows that there were statistically significant differences (p<0.005) in Turkish (F=12.908), Music (F=12.908), Communication and Social Interactions (F=0.432), Team work and Responsibility (F=0.061), Efficient Studying (F=7.312), and Environmental Sensitivity (F=78.66). Conclusion: The present study shows that bruxism had no effect on school success of children. However, there were differences in children’s behavior and study habits in school.