Keep all appointments on time. White lines or streaks may occur from physical trauma that does not cause blood vessels damage. Finally, I will explain when you should speak with your physician about a possible fungal infection of your toenails. However, in practice it works best with women aged 40 and above. Sometimes, it can spread to the entire nail and cause it to turn yellowish or dark brownish, thicken, crack, or detach itself from the nail bed. Most likely, your podiatrist recommends prescription antifungal medications such a Sporanox and Lamisil. The infection can spread untreated, increasing the chance of complications. Kimberly, who is the oil supplement's creator, said that the oil supplement contains no chemicals.