Too much pruning of nails can cause nails to grow into the flesh, which can cause bone inflammation or ulceration in severe cases and eventually lead to amputation. Even common nails grow into the flesh, and may also need to transplant nails or burn nail roots, to prevent their reverse growth. Therefore, must be careful when cutting nails. The correct way is to cut the middle and trim the two ends, so that you can easily control the length of the trim and avoid cutting the corners too deeply. Otherwise, the new long out of the nail easily embedded in soft tissue, become a "ingrown toenails", damage the skin around the nail, causing pyogenic infection of subcutaneous tissue and cause other inflammation; when cut to flat cut, do not nail clippers into nails cut out; if the nails have sharp edges, be sure to the sharp corners rounded. In addition, but also timely treatment of nail edge burns, not directly by hand removal, so as not to hurt the surrounding skin tissue, carefully use a nail knife to cut the corn roots. So, how long nails cut a suitable? A person's fingernails to about 0.7 mm per week on average growth rate, that cut two times a week; toenails growth rate is relatively slow, but 1 months cut 1 - 2 times. The proper length of the nail cut is: the nail tip and the finger tip are flat or slightly longer, leaving a small white edge can be. Fifteen cool knowledge about nails 1. nails grow on average 3.5 millimeters per month. According to the American Academy of Dermatology: use the hand fingernail growth rate will be faster, a monthly average of only 1.6 mm long toenails. 2. white spots on nails do not indicate calcium deficiency. Leukoplakia is common, harmless, and does not indicate that the body lacks any specific element. The white spot is probably a trace of previous trauma on the nail plate (or nail matrix).The only reliable criterion of truth is always to be consistent. 3. nails and hair are made up of proteins. Nails and hair are made of keratin, but only in different combinations. This means that good hair and healthy food is also good for nails, such as vitamins, proteins, etc.. People also need to eat healthy fats and fats to keep hair and nails moist. 4. men's fingernails grow faster than women. This is the result of the American Academy of dermatology. The only possible exception is that women's nails grow faster than men during pregnancy. 5. nails are unique to primates. Although most mammals have claws, but nails are distinguished in primates and other mammalian animal animal. Primates develop a wider fingertip for grasping things. 6. biting nails is called nail biting. It's the most common tension habit. According to the Internet doctor website, about half of 10~18 year old children bite their nails, but most people stop the habit before they are 30 years old. 7. allow your nails to breathe fully. The hard part of the fingertips is actually living tissue. Smearing the nail polish makes the nail very dry, and eventually makes the nail lose most of its moisture and dries up, leaving the nail lacking flexibility, flexibility and strength. 8. nails are the window to health. Some doctors only through the nail can generally determine the health status of people: blue may have lung disease; in the stratum corneum capillary may have autoimmune diseases. When the nails appear abnormal, timely treatment. 9. nails grow faster in summer than in winter. According to the American Academy of Dermatology, different seasons of the year affect nail growth rates. 10. about 10% of skin diseases are related to nails. About half of nail diseases are caused by fungi. Other common nail disease include vitiligo, vertical lines, bacterial infection and onychocryptosis. Older people are more likely to have nail problems than younger people. 11. pressure affects the health of nails. In addition to biting nails, chronic stress can also inhibit nail growth. Therefore, dealing with stress and ensuring sleep is not only helpful to the health, but also makes the nail have a good growth environment. 12. people dislike the nail across the blackboard. A study carried out in 2011 showed that the frequency of this noise was magnified by the shape of the ear canal. Of course, psychological cues are also working. 13. nail cuticle has protective function. The cuticle can seal moisture and prevent bacteria from entering the human body, this is not the reason for its Manicure division cut off or pick the. The cuticle should be kept as stable as possible. 14. nail hardness is mainly determined by genetic factors. The shape and growth speed of nails are mainly determined by genetic factors. If the nails are often broken or peeled off, it may be too dry. 15. nails need blood to survive. Nail loss after injury is due to the blood supply of the injured nail plate is inferior to the normal nail. When the nail matrix and nail bed grow nails again, this is a new nail.