Soha Basha, Hazar Al-Harbi, & Sahar El-Refai. (2021). An Experimental Study on Histological Evaluation of the effect of Pure Nicotine and Pentoxifylline Gel on Oral Ulcers. New Frontiers in Medicine and Medical Research Vol. 12, 168–176. https://doi.org/10.9734/bpi/nfmmr/v12/4076F