Nail filing : 1- In step 1, use either diamond dust or sandpaper of #400 grit Put the nail of your index finger on the filing device at a 45-degree angle to the device as illustrated . The filing of the nail must be rounded -- make an arch on the underside of the nail and straight over it , too. 2- After finishing the first step, use sandpaper of #1200 or #2000 grit to polish the nail.
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