Before using PDT devices, the following precautions should be taken into consideration to ensure safety as well as beneficial results. To begin with, one must always adhere to the guidelines provided by the manufacturers on how a device should be used including the duration of the treatment and the distance from the skin. People who have sensitive skin and/or have other health concerns are to seek medical advice before commencing the therapy. Next, the eyes should be shielded against bright light by suitable glasses but even still, exposure should be limited as much as possible. The device should be checked on a regular basis and if any cracks or signs of deterioration are found, the device should be discarded. A clean environment is also crucial in order to prevent the risk of infection. These simple rules will help the user achieve the intended effects of PDT therapy with minimal hazards.