Liam Carter
Growing nails can take a lot of time and patience. On average, it takes about six months for fingernails to grow back, and up to 18 months for toenails to regrow. The rate of nail growth depends on various factors, including age, health, diet, and even the season. For instance, nails grow faster during the summer and on the dominant hand. Certain habits like nail biting can weaken nails, while supplements such as biotin and collagen can strengthen them and promote faster growth.
| Characteristics | Values |
|---|---|
| Average growth rate of fingernails | 3 mm per month or 1/100 of an inch per day |
| Average growth rate of toenails | 1 mm per month |
| Fingernail growth time | 4-6 months |
| Toenail growth time | 6 months to 2 years |
| Factors affecting nail growth rate | Age, sex, season, finger size, dominant hand, trauma, injury, overall health, hormones, and pregnancy |
| Ways to improve nail growth | Biotin supplements, collagen supplements, vitamin C, nail hardeners, jojoba oil, and a balanced diet |
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What You'll Learn
Toenails vs. fingernails
On average, it takes about six months for a fingernail to grow back completely, and up to 18 months for a toenail to do the same.
Fingernails and toenails are made of a tough, rigid protein called alpha-keratin, which is also found in the claws, hooves, and horns of vertebrates. However, there are several differences between toenails and fingernails in terms of growth rate, function, and care.
Growth Rate
Fingernails grow at an average rate of approximately 3.5 mm per month, while toenails grow at about half that rate, at around 1.6 mm per month. This means that fingernails grow up to four times faster than toenails. The specific growth rate of each nail may vary depending on age, sex, season, exercise level, diet, and hereditary factors. For example, the nails on your dominant hand grow faster because you use that hand more, increasing the risk of trauma and stimulating nail growth. Similarly, the nails on your longer fingers grow faster, and fingernails grow faster during the day and in the summer.
Function
Fingernails serve a variety of functions, including protecting the distal phalanx, the fingertip, and the surrounding soft tissues from injuries. They also enhance precise delicate movements by exerting counter-pressure on the pulp of the finger, improving grip and enabling certain cutting or scraping actions. Toenails, on the other hand, are less essential to our daily lives. While our primate cousins still use their toes to pick things up, humans generally do not. Thus, toenails are a remnant of our evolutionary past, when early humans used their feet to pick things up and needed toenails for that purpose.
Care
Both toenails and fingernails require proper care to maintain health and avoid common nail disorders. This includes trimming and filing the nails regularly to prevent them from becoming too rough or tangled in materials such as cloth. Toenails may be more susceptible to infection due to factors such as dirty socks, specific types of aggressive exercise, tight footwear, and walking unprotected in an unclean environment. Additionally, certain conditions like diabetes or circulatory issues can impact nail health, requiring close monitoring and medical attention if necessary.
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Nutrition and diet
Fingernails are made of a hard protein called keratin, which is also found in hair and skin. A well-balanced diet that includes protein and a wide array of vitamins and minerals is essential for healthy nail growth.
A diet lacking in biotin, iron, zinc, protein, magnesium, and other nutrients may result in brittle and weak nails or vertical ridges in your nails. Weak nails can also be an early warning sign of health problems such as nutritional deficiencies, diabetes, thyroid disorders, or other underlying conditions.
To promote nail growth and strength, it is recommended to include the following in your diet:
- Protein: Nails are made of protein, so consuming enough protein is essential for nail health. Good sources of protein include eggs, chicken, turkey, lean beef, pork, and fish. Vegetarian and vegan sources of protein include lentils, peanuts, nuts, and dairy products such as cheese and milk.
- Iron: Iron deficiency can lead to brittle or dented nails. Lentils and beans are excellent sources of iron, which can help prevent anemia, a condition that can negatively affect nail health.
- Calcium: Calcium is important for strong nails, just as it is for bones. Calcium supplements that contain vitamin D are preferable.
- Vitamin D: A vitamin D deficiency may cause dry and brittle nails. Salmon, eggs, and fatty fish like salmon are good sources of vitamin D.
- Biotin: Biotin is a type of B vitamin that helps the body convert food into energy. It is also recommended as a supplement to boost nail strength. Lentils and beans are good sources of biotin.
- Omega-3 fatty acids: Fatty acids promote healthy cell development, which aids in nail growth. Flaxseed and fatty fish like salmon are good sources of omega-3 fatty acids.
- Water: Hydration is crucial for nail health. Water aids in delivering nutrients and oxygen to the cells, and dehydration can lead to brittle, dry nails that break easily.
While there is no scientifically proven method to make nails grow faster, a nutritious and well-balanced diet can help strengthen nails and promote their healthy growth over time.
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Nail trauma
On average, fingernails take about two months to regrow completely, while toenails take about four months. However, the time it takes for nails to grow back after trauma can vary depending on the severity of the injury and the health of the individual. In some cases, it can take up to six months for a fingernail to grow back, and up to a year and a half for a toenail.
One common type of nail trauma is subungual hematoma, which occurs when blood becomes trapped between the nail plate and nail bed, usually as a result of trauma. This can cause significant pain, bluish-black discolouration, and, if the injury is large enough, eventual separation and temporary loss of the nail plate. Treatment for subungual hematoma involves relieving pressure by draining the blood trapped under the nail. For small hematomas, this can be done by heating a needle or paper clip until it is red-hot and then piercing the nail. If the injury is acute, nail trephination can be performed to relieve pain and drain blood. However, if the injury is not treated within 24 hours, the blood will coagulate, and trephination will not be effective. In some cases, the nail may need to be removed, and the nail bed repaired.
Another common cause of nail trauma is nail-biting (onychophagia). While this habit may not always cause chronic problems, it can lead to various complications. These include infections (bacterial, viral, and/or fungal), dystrophy, horizontal ridging, depressions, raised areas, and permanent nail shortening. Nail-biting is also a main cause of acute paronychia, an infection in which bacteria get underneath the tissue at the side of the nail, causing swelling and irritation.
To prevent nail trauma, it is important to wear properly sized shoes and avoid ill-fitting footwear, as this can lead to toenail trauma and deformities. Keeping your fingernails trimmed and avoiding nail-biting or cuticle biting can also help reduce the risk of trauma and associated complications.
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Habits and behaviours
Secondly, maintaining a healthy and balanced diet is essential for nail growth. Consuming foods rich in biotin, such as egg yolks, salmon, nuts, and seeds, can promote nail strength and growth. Additionally, collagen supplementation has been shown to improve nail growth and reduce brittleness. A consistent intake of collagen peptides for three to six months is recommended for optimal results.
Thirdly, incorporating nail care products can help strengthen and protect your nails during the growth process. Nail hardeners and oils can be applied to fortify nails, making them less prone to breakage. Jojoba oil, for example, can be used to pamper and nourish your nails while promoting healthy growth.
Regular nail clipping is another habit that can support nail growth. Unlike nail biting, clipping does not carry the same risks and can help maintain nail length. Additionally, keeping your nails elevated and applying a cold compress can help reduce swelling and bruising if you experience any nail trauma.
Finally, it is important to be mindful of any medications or health conditions that may impact nail growth. For example, medications used to treat psoriasis may affect nail appearance, and certain medical conditions common in older adults, such as poor circulation, can impair nail growth. By being aware of these factors and consulting with a healthcare professional, you can better understand and support your nail growth journey.
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Seasonal and age-related growth
Fingernails grow at an average rate of about a tenth of a millimeter per day, or 3.47 millimeters per month. However, there are several factors that can influence the rate of nail growth, including age, season, and overall health.
Seasonal Growth
Nail growth can vary depending on the season. Fingernails tend to grow faster during the summer and slower during the winter. This seasonal variation may be related to factors such as temperature, sunlight exposure, and changes in lifestyle or nutritional intake during different seasons.
Age-Related Growth
Age is a significant factor in nail growth. As people age, their nail growth rate tends to slow down. For example, Dr. William Bean observed that his thumbnail growth rate decreased from 0.123 mm per day at age 23 to 0.095 mm per day at age 67. This decrease in growth rate is likely due to the slowing of blood circulation with age.
Hormones also play a role in nail growth and can cause variations throughout an individual's life. For instance, pregnancy is associated with rapid nail growth, while lactation may lead to slower nail growth. Puberty is another period when hormone levels are in flux, resulting in faster nail growth. As hormone levels stabilize with age, nail growth rates tend to decline.
In summary, while the average nail growth rate is well-established, it is important to remember that individual factors such as age, season, and overall health can influence how quickly your nails grow. These variations are natural and expected, and maintaining good nail hygiene can help support healthy nail growth throughout the year and across different life stages.
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Frequently asked questions
On average, it takes about six months for fingernails to grow back, and 18 months for toenails. However, this timeline can vary depending on factors such as age, health, and nutrition.
Nail growth can be influenced by various factors, including age, health, nutrition, and hormones. For example, nail growth tends to slow down with age and can be faster during pregnancy. Additionally, trauma or injury can increase the rate of nail growth due to increased blood flow to the affected area.
Yes, there are several ways to promote faster nail growth:
- Take biotin supplements, which promote cell growth and nail thickening.
- Consume collagen-rich foods or supplements to improve nail growth and reduce brittleness.
- Maintain a balanced diet and adequate hydration, as your nails reflect your overall health.
- Use nail hardeners or oils to strengthen and protect your nails.
- Avoid nail biting and picking, as these habits can weaken nails and increase the risk of infection.
Yes, the rate of nail growth can vary between different fingers and toes. Generally, toenails grow much slower than fingernails. Nails on the dominant hand and longer fingers tend to grow faster. Additionally, the little finger's nail grows slower than other fingernails.
