Whitish or yellowish nails can occur due to onycholysis. This means separation of the nail from the nail bed. The color you see is air beneath the nail. The treatment is to trim the nail short, don't clean under it, polish if you want to hide the color, and wait two to three months. Persistent onycholysis can make the nails susceptible to fungal infection.
Efinaconazole (Jublia) is a medication that was approved in 2014. It is a topical (applied to the skin) antifungal used for the local treatment of toenail fungus due to two most common fungal species affecting nails (Trichophyton rubrum and Trichophyton mentagrophytes). Once-daily application is required for 48 weeks. The most common side effects of Jublia are ingrown toenails and application site dermatitis and pain.
I fully believe in natural remedies as well as safe, pharmaceutical ones. I have all of the ingredients and essential oils necessary to make my own potions, but as a busy, working Mom I chose the easy route of purchasing the potion already made up. I used this religiously for over a month. I cleaned and trimmed my affected 4 toenails constantly through the process. I saw absolutely no results. Yes, the painted on 2nd step does temporarily improve the appearance of the nail instantly, but that's because of the glossy sheen. Any oil will do that. Once soaked in, my nail looked and remained the same. Perhaps my failure was a result of dipping the brush I used on my infected toes and back into the bottle repeated times. Doesn't that seem counter productive given a fast-spreading fungus? They're slowly growing out but the fungus remains in the grow out and my nails are still thin and fragile. I would have given this product one more star with a pat on the back and a "nice try" but the huge number of immediate, 5-star reviews left me with the instant feeling of being mislead. I may have even given it more time with more realistic reviews.
Use soap and water to wash your feet, and dry well, including between toes. Trim your toenails -- straight across -- to keep them shorter than the end of your toe. Make sure the tools you use are clean, too. Wash clippers and files with soap and water, then wipe with rubbing alcohol. You might be tempted to cover up discolored nails with polish, but don't. Your nail bed can't "breathe," which keeps fungus from going away.