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Yes, it is contagious and if you don't treat the infection, there's a chance it will spread to other nails, so it is important to start your treatment as early as possible. It is best to avoid changing rooms, swimming pools and nail and beauty salons while you have a fungal nail infection to prevent the infection from spreading.

Sally Hansen. Sally Hansen Miracle Gel Nail Polish in Totem-ly Yours, $7.99, available at drugstore.com: This is the only polish I tested that's marketed as a "gel-effect" formula. And it was as impressive as the Deborah Lippmann one, lasting for more than a week without chipping nine days to be exact.

No. It is not recommended to store polish in the refrigerator because it can cause it to thicken. Once taken out of the cold, it could take quite awhile to warm up to room temperature. Today's polish formulas and preservatives improve the shelf life of polish.

If your polish is past its prime, pause before throwing it in the trash. Nail polish is a potential household hazardous waste because it's flammable and can contain toxins such as toluene and dibutyl phthalate. The good news is that many towns and cities have a collection program for household hazardous waste.