Figure 6

HE stains of OL patients with severe dysplasia at t0 (a), t1 (b) and t2 (c HE stains in new areas). The pathological characteristics of the oral lesions at t0, t1, and t2 in the YSGG-PDT treatment of OL patients with severe dysplasia were analyzed by HE staining. Scale bar 500 μm. Magnification: HE × 400.