Researchers studied a 4-year treatment plan for toenail fungal infections using efinaconazole, an antifungal solution applied daily for 2 years, then 2-3 times weekly for another 2 years. The treatment was safe and effective, with all patients who achieved a cure maintaining it through the maintenance phase, and even some non-cured patients improving further. The study included many elderly patients, showing the treatment is safe across all age groups and could help prevent infection relapse.