Tooth trauma is an injury that involves a tooth and/or involves its supporting structures leading to fractures, tooth transfusions or damage to periodontal tissue. Causes of permanent tooth trauma in children are falls, sports activities, and traffic accidents. The mother is the closest person to the child and has an important role in treating the child’s permanent tooth trauma. The aim of this study is to find out how the mother knows about the permanent tooth trauma of her 8-9 years old children. The design of this study uses observational analysis with a population of mothers of children aged 8-9 years of age of 120 and samples of 50 respondents taken using Quota sampling technique. The statistical test results are that the mother’s knowledge of permanent dental trauma has no significant relationship with the age of the mother (p value = 0,151 (> 0,05), past education (p-value = 0,258 (>0,05) work status (p-value = 0,113 (>0.05) and source of health information (p-value= 0,307( >0.05). Governments and dental professional organizations must act quickly to implement dental trauma management education and campaigns in the general public.