Finger nails that are too soft may be related to lack of nutrition, fungal infections, manicure and other factors. You can make your nails hard by supplementing nutrition, medication and caring for your nails. 1. When the lack of nutrients, including calcium, protein, zinc and multi-vitamins lead to soft nails, we should pay attention to nutrition, eat more high-quality protein and some calcium-rich foods, such as sesame seeds, soy products and milk, etc., and appropriate sun exposure to promote calcium absorption, which is conducive to nail hardening. 2. When the fungus infects the nail, it will cause the nail bed to be eroded and become thinner and softer, at this time, you should consult a doctor in time, under the guidance of the doctor to take sensitive antifungal drugs such as terbinafine, or apply topical econazole nitrate on the nails, which can help the nails to become hard. 3. Sometimes some nail polish and polish nails can also lead to softening of nails, at this time, you should stop using nail polish and polish nails, and eat more calcium-rich food to help the recovery of nails. Therefore, you should take calcium supplements, minimize exposure to chemicals, and reduce the number of times you polish your nails to keep them in a healthy state. If necessary, it is recommended that you seek medical attention and follow the doctor’s instructions, rather than using your own medication.