Using Mr. Pumice Nail Fungus Treatment is a breeze. Simply apply the liquid 2 - 3 times a day on the affected nails, whether they're natural or artificial. It can even be used over nail polish. When applying, make sure the nails are clean and dry. As for precautions, if you have any known allergies to the ingredients like lavender oil or tea tree oil, it's best to consult a doctor first. To store this product, keep it in a cool and dry place, away from direct sunlight. With regular use, you can expect to see improvements in your nail fungus condition.