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Objectives: Enlarged adenoids can lead to obstruction of the nasopharyngeal airway and subsequent oral respiration. Oral breathing can cause dry mouth, dehydration in gingival tissue, and resistance to plaque accumulation. This study aimed to evaluate the impact of tonsillectomy on oral health status, salivary pH and flow rate, and common complications caused by tonsillar hypertrophy in children. Materials and Methods: An analytical before-and-after study was conducted on 60 children aged 5-12 years who required tonsillectomy. We gathered data through a questionnaire and collected unstimulated saliva using the spitting method for five minutes. Salivary pH was measured by a pH meter and its volume was determined with a calibrated test tube. The plaque index, bleeding index and modified gingival index were determined using a disclosing tablet, Williams’ probe and observational examination, respectively. All measurements were repeated one month after tonsillectomy. Paired t-test was used for data analysis. Results: We found a significant increase in mean pH and salivary flow rate after tonsillectomy and observed a decrease in oral health indices among the children one month after surgery. Over half of the children who reported complications such as dry mouth, itchy nose and throat, snoring, night sweats, and sleep disturbances experienced complete recovery after tonsillectomy. Conclusion: Based on the results obtained in the present study, children with enlarged adenoids showed significant improvements in salivary pH, salivary flow rate, and oral health indices, one month after tonsillectomy.