Contraindications according to The North American Association for Laser Therapy are;Eyes: Do not aim laser beams into the eyes and everyone present should wear appropriate safety spectacles. Cancer: Do not treat over the site of any known primary carcinoma or secondary metastasis unless the patient is undergoing chemotherapy when LLLT can be used to reduce side effects such as mucositis. LLLT however can be considered in terminally- ill cancer patients for palliative relief.Pregnancy: Do not treat directly over the developing fetus.Epileptics: Be aware that low frequency pulsed visible light (