Nail repair pen is a product specifically designed for gray nail care, which is often used in the process of cleaning, brightening, and thickening gray nails. The following is information about nail repair pens and gray nail care solutions: Cleaning and brightening nails: Nail repair pens usually contain antibacterial and disinfectant ingredients, which can clean the surface of nails and effectively prevent or reduce bacterial infections of gray nails. In addition, some repair pens also contain nail polish ingredients, which can make the surface of the nails smoother and more shiny. Thickened repair: Some nail repair pens are thickened and contain special ingredients such as propylene glycol and polymers, which can increase the thickness and strength of gray nails. This helps to improve fragile and fragile nails, making them healthier and stronger. Usage: When using a nail repair pen, make sure the surface of the nails is clean and dry. Then, gently apply the tip of the repair pen to the affected nails, including the edges and bottom of the nails. According to the product instructions, it can be used once to twice a day as needed. After application, thoroughly dry the repair solution to avoid contact with water or other items, so that the product can fully function. Please note that different nail repair pens may have different usage methods and ingredient ratios. Please use them correctly according to the instructions on the product packaging. If you have serious problems with gray nails or need more professional care, it is recommended to consult a doctor or a professional nail therapist for advice.