ACKNOWLEDGMENTS
We express our gratitude to all the patients who participated in this study. We acknowledge the support provided by Mr. Toru Hibi from PHARMA SEEDS CREATE, LIMITED LIABILITY CO. (4‐12‐10, Tsutsujigaoka‐Minami, Sanda, Hyogo, 669‐1347, Japan) for their guidance in manufacturing the ibuprofen gargle utilized in this study. Furthermore, we extend our appreciation to Enago for their English‐language review assistance. The Japan Society supported this work for the Promotion of Science, KAKENHI, Grantin‐Aid for Young Scientists (grant no: 19K16413). However, the funding agency played no role in the study design; collection, management, analysis, and interpretation of data; writing of the report; and the decision to submit the information for publication. The funding agency can be contacted at the following web address: 