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To Thin the Top of the Big Toe Nail: While the nails are still a bit damp, use the Large Sapphire Cone Bit (Figure 7) included with PediNova Electric Nail Grinder, to grind the thickened nail from the top. Use gentle pressure and grind it thinner until it is normal thickness or starts to get warm. If it gets warm, stop and then do a little more later or the …