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A Class 3R laser is considered safe if handled carefully, with restricted beam viewing. With a class 3R laser, the MPE can be exceeded, but with a low risk of injury. Visible continuous lasers in Class 3R are limited to 5 mW. For other wavelengths and for pulsed lasers, other limits apply.
In this study from a cancer center, they concluded that low-level laser was a promising therapy for prevention and treatment of mucositis for the cancer patients in their study.he objective of the present review was to summarize the results of applications of low-power visible and near infrared radiation for the treatment of patients with cancer during the last 20-25 years.