Figure 4

OL patients with severe dysplasia at t0 (a), t1 (b) and t2 (c), New lesions occured in new areas). The lesion changes at t0, t1, and t2 in YSGG-PDT treatment of OL patients with severe dysplasia were recorded by taking pictures.

OL patients with severe dysplasia at t0 (a), t1 (b) and t2 (c), New lesions occured in new areas). The lesion changes at t0, t1, and t2 in YSGG-PDT treatment of OL patients with severe dysplasia were recorded by taking pictures.