Perhaps you meant to ask how *humans* keep their fingernails healthy? If so, here are some tips:
* Keep nails clean and dry: This helps prevent bacteria from growing under your nails.
* Trim nails regularly: Use sharp manicure scissors or clippers. Trim straight across, then round the tips in a gentle curve.
* Moisturize: Apply lotion to your hands and nails, especially after washing them.
* Avoid harsh chemicals: Wear gloves when using cleaning products.
* Don't bite or pick at your nails: This can damage the nail bed.
* Use nail hardener sparingly: Overuse can make nails brittle.
* Eat a healthy diet: A balanced diet with plenty of vitamins and minerals can promote healthy nail growth.
* Consider biotin supplements: Some people find that biotin helps strengthen their nails. However, it's best to talk to your doctor before taking any supplements.
* See a doctor if you have concerns: If you notice any changes in your nails, such as discoloration, thickening, or separation from the nail bed, see a doctor to rule out any underlying medical conditions.