Objective: The present study compared the efficacy of preoperative administration of paracetamol and placebo in reducing postoperative pain after routine dental treatment in children. The primary objective was to compare postoperative pain level between the groups. The secondary objective was to identify other factors that can influence postoperative pain. Method and materials: A prospective, placebo-controlled parallel-group trial was conducted on two groups of children aged 5 to 12 years. One hundred and two children participated in the study, 51 in each group, 58 boys (56.9%) and 44 girls (43.1%). The average age was 7 ± 1.72 years, with no difference in age and sex between the groups. The study group received paracetamol (15 mg/kg) and the control group received placebo 15 minutes before dental treatment. Pretreatment baseline anxiety was recorded. Postoperative data were collected immediately at the end of the treatment, and by phone 2.5 hours after taking the remedy. Results: The groups showed no difference in postoperative pain immediately after the treatment and 1.5 hours after treatment. The pain score was higher among children who received stainless steel crowns and combinations of crowns, pulpectomy, and extractions. Conclusion: Preoperative use of paracetamol has the same preemptive analgesic effect as placebo in pediatric patients who receive routine dental treatment. Clinical relevance: Postoperative pain can influence the willingness of children to receive consecutive treatments. Dental practitioners should prevent postoperative pain and recommend analgesia when necessary. Pain is expected after performing stainless steel crowns, pulpectomies, and extractions. The current study confirms that preoperative paracetamol has no beneficial effect. Palabras clave: dental care for children, pediatric dentistry, preoperative analgesia, preoperative paracetamol, postoperative pain