ZAINAB KHATOON1 , VALIYA SHEIKH 2 , ZUBIA SALMAN3 , DR. RANJIT TIWARI4 2026. AN OBSERVATIONAL STUDY ON THE EFFECTS OF BETEL NUT CHEWING ON MASTICATION MUSCLES AND THE DEVELOPMENT OF TRISMUS. International Journal of Pharmacy with Medical Sciences. 6, 2 (Jun. 2026), 65–85. DOI:https://doi.org/10.64751/.