There are many different types of hair, including straight, curly, wavy, and coily.
Depending on a person’s hair type, they may need to follow different care instructions.
This article will provide some general information about hair types and detail some specific care instructions.
What does hair type mean?
Hair type typically refers to the shape of a person’s hair. Hair can be straight, wavy, curly, or coily.
According to one 2020 articleTrusted Source, hair consists of two structures: the strand of hair itself, or the hair shaft, and the hair follicle.
The hair shaft consists of different layers, including the cortex, the surrounding cells, and, in thicker hair, a central medulla.
A 2017 studyTrusted Source notes that the shape of the hair follicle determines the shape of a person’s hair. For example, the hair follicles for curly hair are in the shape of an S.
Genetic factors play a role in deciding the shape of a person’s hair follicle.
What types of hair are there?
Hair shape refers to the degree of curliness of a person’s hair.
One review articleTrusted Source notes that different researchers have used different hair shape categorization systems in their research about hair. For example, some have used use labels such as:
Some hairstylists like to distinguish hair shapes into four categories. However, scientists do not use this categorization system in medicine or scientific research.
Hairstylists use the following categorization system:
Hair density refers to the number of hairs that a person has on their head. The more hairs a person has, the higher that person’s hair density.
Hair structure refers to the thickness of the strands of hair. A person’s hair can be:
Hair porosity is a measure of the amount of moisture that a person’s hair can absorb.
Hair porosity depends on how many gaps or tears are present in the cuticle layer. The cuticle is the outer layer of the hair, which protects it from wear and tear.
According to one 2015 articleTrusted Source, hair is naturally porous. However, hair that has sustained damaged due to bleaching or chemical treatments is more porous than untreated hair.
People may find it helpful to avoid strong chemical and high heat treatments to let their hair recover.
General hair care tips
According to the American Academy of Dermatology (AAD), people can try the following when caring for their hair:
If possible, they should try to limit:
Care instructions for straight hair
There is some evidence to suggest that straight hair carries sebum more easily than curly hair. Sebum is a waxy, oily substance that a person’s skin produces. This means that people with straight hair may be more likely to get oily hair than those with curlier hair.
For this reason, people with straighter hair may wish to avoid the excessive use of certain hair products. These include:
People with straight hair may also wish to wash their hair more frequently.
According to a 2015 articleTrusted Source, a person with straight hair may need to use a more gentle approach to caring for their hair. This may involve:
Care instructions for curly hair
Over-brushing can damage curl definition. Therefore, people with curly hair may need to experiment to find the right amount of brushing for their hair.
Some other care tips for curly hair include:
Some people may also wish to use hair mousses and gels that are intended for curly hair to maintain curl definition.
Care instructions for Black hair
The AAD suggests the following tips for Black hair:
Additionally, people may wish to take care when using weaves or extensions. To prevent hair damage, they may wish to try:
Tight hairstyles can also lead to traction alopecia, which results in hair loss. People may wish to consider giving the hair a break after 2–3 months of wearing a weave or extension.
Care instructions for thick hair
People with thick hair may find it helpful to use denser hair products, such as:
Additionally, people with greater hair density may find it beneficial to use brushes that are designed for thick hair. These brushes have fewer spokes than others, which helps people remove knots without breaking the hairs.
Care instructions for thin hair
There is anecdotal evidence to suggest that denser hair products, such as oils and butters, can weigh down thinner hair. For this reason, people with thin hair may wish to avoid these products.
People with thinner hairs may also benefit from:
The WTS notes that people shed approximately 50–150 hairs per day. This can occur through hair washing, brushing, and combing. However, some people lose more hair than they can grow.
This can happen for various reasons. One common cause is androgenetic alopecia. This is a genetically predetermined condition that affects around 50%Trusted Source of people. In males, hair loss occurs at the temples and the top of the head. In females, hair loss can affect the crown.
Hair loss can also occur in females due to other health conditions, including:
A person should contact a doctor if they:
Is it preventable?
Some anecdotal evidence suggests that people can use certain shampoos, essential oils, and dietary supplements to thicken the hair. However, there is no scientific evidence to prove that hair care can prevent thinning hair.
That said, a person can take measures to help prevent some causes of hair loss, such as traction alopecia.
Everyone’s hair is slightly different. A person’s hair can be straight, curly, coily, or wavy, and each type benefits from different methods of care.
Although some hair loss is common, a person should contact a healthcare professional if they are concerned.