Many derma roller companies sell purifying tablets to make cleaning easy. If your roller came with a tablet, read the instructions detailed on the packaging. If your derma roller does not have a cleaning tablet, use denture tablets instead. Denture tablets are designed to sanitize, and you can safely use them on your derma roller. Different purifying tablets will call for varying levels of water. Typically, they use about 1  c (240 mL) or so. Measure the water with a measuring cup, and pour it into a small dish. If your derma roller cleaning container has a fill line on the outside, simply use that as a guideline as you fill it. Rip open the packaging around the individual tablet, and place the tablet into the water. Once you dunk the purifying tablet in the water, the chemicals in the tablet mix with the water to create your sanitizing solution. This happens instantly, so place your derma roller into the water right after the tablet. Make sure the entire derma roller is completely covered for a thorough clean. Follow the directions on the packaging to ensure your derma roller is completely sanitized. Some purifying tablets only need to soak for 5-10 minutes. If you are using denture cleaning tablets, leave your derma roller in the solution overnight. Once your derma roller has soaked thoroughly, use warm water to rinse off the solution. Then, set the roller on a clean paper towel for 10-20 minutes so it can air dry. If you pat your roller to dry, it may bend the needles. If the needles are bent, they may scratch your face.

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Write a summary of the previous text in Vietnamese:
Dùng viên thuốc chuyên dụng hoặc thuốc ngâm răng giả để làm sạch cây lăn kim. Rót nước ấm vào vật đựng như hướng dẫn. Thả một viên thuốc vào hộp và ngâm cây lăn kim. Ngâm cây lăn trong khoảng thời gian như hướng dẫn. Rửa lại cây lăn trong nước ấm trước khi đặt lên khăn giấy.