Inclusion Criteria:  Demonstrates understanding of the study and willingness to participate as evidenced by voluntary written informed consent and has received a signed and dated copy of the informed consent form. 18 years and older. Self report canker sore outbreaks once every 30 days or more frequent Understands and is willing, able and likely to comply with all study procedures and restrictions. No previous experience of LLLT. United States resident. Willingness and ability to submit a $49 deposit using a credit card for the device.  Exclusion Criteria:  Patients with a known systemic disease that predisposes them to RAS (e.g., Behçet disease) or undergoing systemic treatment for RAS. The presence of a serious medical condition. Currently known to be pregnant or breastfeeding Patients treated with topical or systemic medication for RAS, such as corticosteroid therapy, antibiotics or analgesics during the previous month.