Table 4 . Comparison of Size of the Lesion in Both the Groups Before and After Therapy .

	Before Treatment		After Treatment		P Value
	Mean	SD	Mean	SD
Photodynamic therapy in oral leukoplakia	1.82	0.89	1.16	0.98	<0.001
Photodynamic therapy in oral lichen planus	2.22	0.79	1.41	0.74	<0.001
Medication group in oral leukoplakia	2.09	0.77	1.93	0.75	0.017
Medication group in oral lichen planus	2.27	0.88	1.74	0.77	0.001

Paired t test.