Fig. 2.

Wound healing and pain threshold detection in oral ulcer area. (A) Representative images of oral ulcers on days 3, 5 and 9 after acetic acid induction. (B) Comparison of oral ulcer healing time in TPPU-Treated groups (TPPU) and PBS-treated groups (PBS). (C) Quantification of oral ulcer area size on days 3, 5, 7 and 9 after acetic acid treatment in TPPU groups and PBS groups. (D) Comparison of pain threshold in oral ulcer area between TPPU groups and PBS groups. * p < 0.05, ** p < 0.01, *** p < 0.001.