Extra Strength Nail Fungus Repair Pen Kit Features Powerful Anti-Fungal Core Active Formula Infused with high-efficiency undecylenic acid and natural tea tree oil, targets fungal infection deep inside nail layers, inhibits fungus growth to fix yellow, thick, brittle, cracked nails effectively. Convenient Brush-Tip Pen Precise Application Slender built-in brush tip delivers controlled serum directly onto nail surface, cuticles and gaps; no messy dripping, easy to apply on hard-to-reach toenail corners and tiny crevices daily. Complete Repair Accessory Bundle Included Comes with matching nail buffer patches to gently file away rough thickened damaged nail layers before treatment, boosting serum penetration for faster restoration effect. Mild Gentle Non-Irritating Ingredients Balanced gentle formula avoids harsh burning irritation on surrounding healthy skin, safe for regular long-term use on both fingernails and toenails for mild to moderate fungal issues. Portable 5-Pen Full Treatment Pack 5 individual 3ml pens (15ml total volume) offer extended supply for full recovery cycles; slim pen design fits pockets, travel bags and bathroom drawers for consistent at-home nail care anytime.