Infusion and sleep! I learned this while waiting in line at the SUS (National Health Service), having suffered from a rotten nail for 20 years.

How to use it?
Prepare equal parts apple cider vinegar and water. Soak your hands or feet in the solution for 15 to 20 minutes.
Once the treatment is complete, dry the treated areas thoroughly and apply moisturizer.
2. Clove Oil
Clove oil is an excellent natural option for nail fungus because it is rich in eugenol, which has demonstrated powerful antifungal action, helping to fight fungi that cause nail fungus, such as Candida albicans, Trichophyton rubrum, and Trichophyton mentagrophytes.
Directions: Apply 1 drop of clove oil directly to the affected nail at least twice a day, after washing the affected area with soap and water. To prevent skin irritation around the nail, you can mix 2 drops of clove oil with 1 tablespoon of carrier oil, such as coconut, sweet almond, or jojoba oil.
3. Natural Yogurt