A Randomized, Double-Blind, Placebo-Controlled Trial on Clinical Efficacy of Topical Agents in Reducing Pain and Frequency of Recurrent Aphthous Ulcers

Classification	Erythema Level	Exudation Level
0	No erythema	No exudation
1	Light red/pink	Light exudation
2	Red but not dark in colour	Moderate exudation
3	Very red, dark in colour	Heavy exudation, with pseudo membrane