Ava Monroe
Our nails are made of a protein called keratin, which is also found in our hair and skin. Nails grow out of a nail root hidden under the cuticle, and new nail cells are constantly pushed out by newer nail cells, forming the nail plate. The rate of nail growth depends on various factors, including finger or toe, dominant hand, season, age, sex, exercise, diet, and genetics. For example, the nails on the dominant hand tend to grow faster, and nails grow more in the summer. Toenails grow much slower than fingernails and take longer to regrow if lost. While there are no scientifically proven methods to make nails grow faster, maintaining good nail hygiene and taking biotin can help strengthen nails and prevent breakage.
| Characteristics | Values |
|---|---|
| What are nails made of? | Keratin |
| What is the purpose of nails? | To protect the tips of the fingers and toes |
| What is the average growth rate of fingernails? | 3.47 mm per month or 0.1 mm per day |
| What is the average growth rate of toenails? | 1.62 mm per month |
| What factors affect nail growth? | Age, sex, season, exercise level, diet, hereditary factors, hand dominance, finger length, blood flow, trauma, and overall health |
| What is the nail matrix? | The nail matrix is the area under the cuticle where nail growth originates; it controls the curvature and thickness of the nail plate |
| What is the nail plate? | The nail plate is composed of about 50 layers of nail plate cells stacked upon each other, pushed upward by newer nail cells |
| How to maintain nail health? | Regular trimming, moisturization, and good nail hygiene |
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What You'll Learn
Fingernails are made of keratin
Keratin is a key component in many other parts of the body, including the cells that line internal organs and various glands. It is also found in animal claws, hooves and horns, which are similar in structure to human nails. In the body, keratin forms cells that are compacted and pushed out over the nail bed as new cells form and harden. This process gives rise to the nail plate, which is the hard, protective shell at the end of our fingers and toes.
The part of the nail that can be seen is made up of dead cells, which is why cutting or trimming nails is painless. These dead cells are pushed out by the growth of new cells underneath, which occurs at a rate of about 3 millimetres per month for fingernails and slightly slower for toenails. The rate of growth also depends on various factors, including age, hormone levels, overall health and the finger on which the nail is located. For example, nails grow faster during the summer and on the dominant hand.
Fingernails serve several important functions. They protect the sensitive nerve endings and blood vessels in our fingertips, increase the sensitivity of our fingertips by detecting pressure changes, and help us to judge how to hold objects. Nails also provide clues about our health status, lifestyle and recreational habits, and can even indicate whether we are stressed.
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Nail growth and nutrition
The growth of nails, like hair, is linked to nutrition and overall health. While the average rate of fingernail growth is about a tenth of a millimeter per day or 3.47 millimeters per month, there are several factors that influence this rate. Nails grow faster in the summer, on the dominant hand, and on longer fingers. This is supported by the theory that the rate of nail growth corresponds to the amount of blood flowing through the digit. As the heart is closer to the hands than the feet, more blood flows through the fingers, resulting in longer fingernails.
Age is also a factor, as nail growth tends to peak during puberty and decline as hormone levels balance out with age. For example, an observation by Dr. William Bean showed that his left thumbnail grew at a rate of 0.123 mm per day when he was 23 years old, but this rate decreased to 0.095 mm per day by the time he was 67. Pregnancy is another time when hormone levels can affect nail growth, causing rapid nail growth.
Nutrition plays a role in nail health and growth. Biting or picking at nails can lead to infections and nail deformities, so it is important to maintain good nail hygiene and care. Regular trimming, moisturizing, and the use of hand lotion are recommended. Additionally, nutritional deficiencies can impact nail growth, so seeking advice from a healthcare professional is advised if unusual symptoms or slow nail growth is observed.
The nail plate, composed of about 50 layers of nail plate cells, is formed by the nail matrix. The matrix controls the curvature of the nail plate, and its shape determines the free edge shape of the natural nail. While the nail plate may give the appearance of thickening, the matrix does not grow longer, and the plate contains the same number of layers. However, when these layers of nail plate cells separate due to infection or other factors, it can create the false appearance of thickening.
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Nail injuries and repair
Nail injuries are common and can occur in many ways, including when a heavy object hits or crushes the fingers or toes, or when a person sustains a cut from a sharp object. A nail injury can also occur when the nail is cut, torn, smashed, or bruised, or when the nail is torn away from the skin.
Treatment for nail injuries:
The treatment for a nail injury depends on the type and seriousness of the injury. For minor injuries, such as a small nail bruise, home care may be sufficient. This includes basic wound care, such as washing any cuts or scrapes with soap and water and then applying a bandage. For a nail bruise, a doctor may decide to drain the blood by creating a small hole in the nail plate to relieve the pressure and pain.
For more serious injuries, such as lacerations, avulsions, or a large nail bruise, it is recommended to go to a hospital's emergency department. There, the doctor will examine the injury and decide on the appropriate repair techniques. The finger or toe will be numbed before starting any work, and a tourniquet may be used to slow blood flow and prevent bleeding during the procedure. If there is a cut or laceration to the nail bed, the doctor will use stitches to repair the damage and reattach the nail if possible. If the nail cannot be reattached, a synthetic nail may be attached and gradually pushed forward as the new nail grows. Antibiotics may be prescribed to prevent infection, especially if there is a broken bone or a bite wound.
It is important to note that if you have an artificial nail, it should stay in place until the nail bed has healed. The wound dressing will need to be changed daily, and a small amount of antibiotic ointment can be applied to prevent the dressing from sticking. A splint or special shoe may also be used to protect the injured area during the healing process.
Factors affecting nail growth:
The rate of nail growth can vary depending on several factors, including the finger on which the nail is located, the hand dominance, the season, age, hormone levels, and overall health. Nails on the dominant hand and longer fingers tend to grow faster, and nails also grow more rapidly during the day and in the summer. Additionally, nail growth is said to peak during puberty and decline as hormone levels balance out with age.
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Nail growth and hand dominance
The growth of fingernails is influenced by a variety of factors, including hand dominance. On average, fingernails grow at a rate of about a tenth of a millimeter per day or approximately 3.47 millimeters per month. However, the nails on the dominant hand tend to grow faster than those on the non-dominant hand. This difference in growth rate is attributed to the more frequent use of the dominant hand, which makes it more susceptible to damage and trauma.
When the nail on the dominant hand sustains trauma, such as catching it on an object or hitting it with a tool, the body responds by increasing blood flow and sending more nutrients to the affected area to facilitate repair. This influx of nutrients can lead to accelerated nail growth on the dominant hand. The increased risk of trauma to the dominant hand is a crucial factor in understanding why its nails often grow at a quicker pace.
In addition to hand dominance, other factors come into play when considering nail growth. For instance, the specific finger also plays a role, with the middle finger's nail typically growing the fastest and the little finger's nail growing the slowest. The length of the finger seems to be a factor, as nails on longer fingers tend to grow more rapidly. Moreover, the time of day, season, age, hormone levels, and overall health can influence nail growth rates. For example, nails grow faster during the day and in the summer, while age-related changes in blood circulation can cause growth rates to slow down over time.
Hormones also have a significant impact on nail growth. Pregnancy, puberty, and lactation are key periods when hormone levels fluctuate, affecting nail growth. During pregnancy, increased estrogen and progesterone levels lead to faster nail growth, while the opposite occurs during lactation. Puberty, a time of hormonal upheaval, is associated with peak nail growth rates, which then decline as hormone levels stabilize with age.
While there are no scientifically proven methods to accelerate nail growth, maintaining overall nail health can help strengthen nails and prevent breakage. Taking biotin supplements, for instance, has been shown to enhance nail health and reduce breakage. Additionally, while nail hardeners can be used sparingly to strengthen nails, prolonged use may negatively impact nail health over time. It is also recommended to limit or avoid strengtheners containing formaldehyde or formalin. Instead of glue-on nails and toxic polishes, opt for nontoxic or water-based polishes to reduce the risk of nail breakage.
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Toenail growth rate
Toenails grow much slower than fingernails. They grow at an average rate of 1.62 mm per month, compared to the average rate of 3.47 mm per month for fingernails. This means that toenails grow at about one-third to half the rate of fingernails. If you lose a toenail, it can take up to a year and a half for it to completely grow back, whereas a lost fingernail will usually take around six months.
The rate of growth also depends on which toe the nail is on. The great toenail, for example, has been found to grow faster than other toenails. This may be because the big toe is used more often and is more likely to experience trauma, which could lead to quicker nail growth as the body sends more blood and nutrients to the area to aid healing.
While there are no scientifically proven methods to make toenails grow faster, there are ways to increase their overall health and prevent them from breaking. These include taking biotin supplements, eating a nutritious diet, and practicing good nail hygiene by keeping toenails clean and dry, trimming them regularly, and avoiding biting them or cutting them too short.
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Frequently asked questions
Finger nails are made of a substance called keratin, which is also what your body uses to create hair and the top layer of your skin.
Nails start in the nail root, hidden under the cuticle. When cells at the root of the nail grow, the new nail cells push out the old nail cells. These old cells flatten and harden, thanks to keratin. The newly formed nail then slides along the nail bed.
The rate of nail growth is dependent on several factors, including age, sex, season, exercise level, diet, and hereditary factors. Nails on the dominant hand, longer fingers, and nails during pregnancy tend to grow faster. Toenails, on the other hand, grow much slower than fingernails.
