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A'yun, Quroti and Widyasari, Resha and purwati, dwi eni and Purnama, Tedi (2021) Gargling with Black Tea as in effort to UIncrease Saliva pH in Elementary School Student. Journal of Drug Delivery and Therapeutics (JDDT), 11 (6). pp. 173-175. ISSN 2250-1177