To use this lipstick, simply apply it directly to your lips. You can start from the center and spread it outwards for an even finish. For best results, apply it after exfoliating your lips to remove dead skin. As for precautions, avoid contact with eyes. If you have any allergic reactions, stop using it immediately. To maintain the quality of the lipstick, keep it in a cool and dry place away from direct sunlight. Also, make sure to cap it tightly after each use to prevent it from drying out.