Low-level laser therapy vs. FDA-approved 5% Amlexanox: A comparative study to understand the healing effects in a cohort of minor apthous ulcer patients Introduction Recurrent apthous ulcer (RAU) or recurrent apthous stomatitis (RAS) which are commonly called as canker sores are small, round, oval-shaped ulcers having yellow or gray floors and are surrounded by erythematous haloes.1 They generally occur in the oral mucosa and rarely on the gums.2 It has been observed that about 5–25% of the population