Using this Sakura lip mask is easy. First, clean your lips thoroughly. Then, apply the lip mask evenly on your lips. Leave it on for about 15 - 20 minutes, and then gently remove it. You'll notice your lips feel softer and more moisturized. As for precautions, keep it out of reach of children. Also, if you have extremely sensitive skin, it's a good idea to do a patch - test on a small area of your lips first. To maintain the quality of the lip mask, store it in a cool and dry place away from direct sunlight.