It's estimated that hundred thousands of people in Hong Kong has fungal toenail, or onychomycosis, which is fungus infection of the toenail, characterized by a progressive change in a toenail's quality and color, which is often ugly and embarrassing.  In reality, the infection happens underneath the nailplate, where the tiny organism resides, causing darker color, foul smelling, and debris.  They are capable to spread to other toenails, the skin, or even the finger nails.  The resulting thicker nails are difficult to trim and cause pain when inside shoes, in some cases even cause ingrown toenails.

Who gets Fungal Toenail?

Frequent contact of damp areas (such as swimming pools, showers), those who have athlete's feet, previous injury to the nail bed, people with chronic diseases (such as diabetes, circulatory problems, immune-deficiency conditions), advanced age, people with excessive perspiration, or those who are required to wear closed shoes for long hours are especially prone to fungal nails.