“…Meanwhile, LLLT can be applied to treating a variety of conditions, including damaged wound, pain and in ammation [14]. Although TENS is easier to use than LLL because of its small size, low risk, and convenient portability, the current delivered to the skin through TENS may make some patients uncomfortable [12]. Some experts observed that patients were easy to accept LLLT during the treatment process because LLLT does not emit heat, sound, vibration or light in the infrared spectrum, making it indistinguishable from placebo therapy.…”