There are many ways in which hair can be categorized; length, texture, color, and density. Hair density describes how many hair strands you have for every square inch on the scalp. Hair density is the factor that determines the best way to style your hair.
On average, we have between 80,000 and 120,000 hair strands on our head, and the highest density is found at the back or vertex of the head. Hair density is different for every person, and it may be influenced by some factors like age and ethnicity.
For example, Caucasians are seen to have the highest hair density of about 1,450 strands for every square inch. Also, Africans have a hair density of around 961 strands in every square inch of the scalp.
Also, hair density is lower at younger ages and increases as we hit puberty and teenage years. For example, at the age of 20-29, the average hair density is about 1,066 hair strands per square inch, while it ranges about 1,004 strands per square inch at the age of 60-69.
Counting how many strands of hair you have can be hard, but you do not have to count one strand after the other or use a microscope to know your hair density. If you visit a hospital, they use trichoscopy, an imaging technique to determine how much hair you have per square inch.
That is one of the most accurate ways. However, you do not need to go to a doctor. You can determine your hair density at home using several methods. The first one involves testing how easily you can see your scalp through your hair.
If you can see it without moving your hair, your hair density is low. If you have to move your hair a little to see the scalp, that is medium density. However, if you can't see your scalp unless you section your hair, that is high hair density.
You can also measure the circumference of your ponytail to determine your hair density. The smaller the circumference, the lower the density. If the circumference is below 2 inches, that is low hair density, but it is high density if it is over 4 inches.
Also, how many times you twist your hairband over the ponytails can tell you your hair density. You can also ask your hairdresser if you are having a hard time determining.
Low hair density can be caused by a variety of reasons;
If you have low hair density, there are several ways that you can increase it;
Natural Remedies

1. Eggs
Eggs are rich in protein that not only helps repair our body and build muscle but can also be used to increase the hair density. Hair is made up of a protein called keratin, which means that a protein boost from eggs will increase the protein in your hair.
Eggs help repair damage that has been done on your hair and also leaves it shiny. To use it;
Alternatively;
You can mix the eggs with aloe Vera gel, fenugreek seeds, or bananas. Those ingredients will add the mixture's nutritional value, boosting the strength and health of your hair.

2. Olive Oil
Olive oil is packed with omega3 fatty acids and other nutrients, which are important for your body and hair's health. When you apply it directly to your hair and scalp, it increases your hair's strength, density, and shine. It also prevents a dry scalp and dry hair.
To apply olive oil;
You can add honey to the olive oil or leave it in your hair overnight and cover it with a shower cap for additional nutrients.

3. Aloe Vera
We all know of the numerous benefits of Aloe Vera, including how beneficial it is to our health. Aloe Vera can also be used to improve the density and strength of your hair.
It has antimicrobial and anti-inflammatory properties that keep your scalp healthy and clean. It also has nutrients that keep your hair follicles strong, preventing hair breakage.
To use aloe Vera;
You can also mix aloe Vera to your daily hair oils for daily use. If you can access aloe Vera leaves, ensure that you buy products that have aloe Vera gel as an ingredient.

4. Onion Juice
Onions are a great remedy to solving hair loss issues and improving hair texture. To use it;

5. Fenugreek Seeds
Fenugreek seeds are packed with antioxidants that help fight free radicals found in the body. Free radicles weaken the hair follicles, causing hair breakage and fallout. To use them;

6. Avocado
Avocado is packed with vitamin E that is good for your hair and also acts as a good moisturizer. To use it;

7. Orange Puree
Vitamin C is vital for the strength and health of your hair. Oranges are packed with vitamin C and pectin, which help strengthen your hair. They also have a lot of acids, which is useful in breaking off some of the products that may have built up in the hair.
Those build-up products may negatively affect the growth and strength of your hair. Also, orange puree, unlike other home remedies, has a pleasant smell. To use;
You can use a conditioner to moisten the hair after using orange puree.

8. Henna
Henna is known for making hair look and feel luxurious and soft. It also helps in boosting its volume. To apply;

9. Castor Oil
Castor oil is rich in fatty acids and vitamin E, which are essential for strong and healthy hair. To use castor oil, you do not need any preparation. You just have to apply it directly into your scalp and your hair, massage it until all of your hair is coated.
Leave it in for about 30 minutes, then rinse it out with a mild shampoo and lukewarm water.

10. Apple Cider Vinegar
Apple cider vinegar is made from fermented apples, and it contains acids that are good in maintaining your hair health. There are several ways you can use apple cider vinegar to improve your hair volume and strength.

Lifestyle Changes
There are some things we do in our daily lives that may affect the health of our hair, causing it to fall out and lose volume. There are some lifestyle changes you can make to boost the volume of your hair.
1. Avoid Heat
Heat is the number one enemy of your hair. Heat rips your hair off its natural oils that keep it flexible and shiny. Therefore, it leaves that hair looking dry, weak, and brittle, which increases hair breakage.
Avoid using hair styling and drying tools that use a lot of heat. Instead, let your hair air dry or use heatless equipment. Also, wash your hair with lukewarm or cold, and not hot water.
2. Use the Right Products
Your hair might lose its volume because you use very harsh products on it. Avoid over-scented soaps because the artificial scents may contain chemicals that damage your hair.
3. Avoid Stress
Stress is a leading cause of hair fallout. Avoid stressful situations, and do your best to remain relaxed.
4. Moisturize Your Hair
Dry hair is more brittle and prone to breakage and fallout. Ensure that you use moisturizing oils and shampoos.
5. Wash Your Hair Regularly
Your hair collects a lot of dust and sweat throughout the day that may affect how your hair grows and its overall health. Ensure that you wash it regularly, but don't over-wash it to avoid striping it of its natural oils.
Diet
What you eat determines the health, strength, and density of your hair. Some of the nutrients and vitamins you need to add to your diet include;
Also, ensure that you remain hydrated.
If neither of the methods works, you can visit your doctor, who will give you a better and more permanent solution.