Hair growth is approximately 0.5 inches per month, being about 6 inches per year. Cell division is responsible for the hair growth cycle, where the new cells push the hair forward to make it longer, and the new hair is added at the root. There are about 100.000 hairs on a healthy scalp of hair. Each of these hairs will, in normal healthy conditions, last for one up to six years. People lose about 100 hairs per day, in normal conditions. And the fallen hairs are replaced by new hair. During its life a hair goes through three phases of growth: the anagen, the telogen and the catagen.
This is the first phase of your hair growth cycle which is also known as the growing phase with new hair growing in the hair bulb. At any one time, 80 - 90 percent of your hair follicles on your scalp are in the ANAGEN phase. During this period your will hair grows continuously. The growing will continue for 3 to 7 years and will grow at about the rate of half an inch a month (also depends on genetics). During that time, the hair bulb produces your hair pigment and your blood supply provides nutrients and minerals to your hair to make it look thick and nourished.
After the ANAGEN phase, your hair will turn into a transitional phase before going to rest. This short phase is known as the CATAGEN phase which last for 2 to 4 weeks. It is the phase when hair stops growing because the cell division stopped. During this time, your hair detaches from the blood supply and the detached follicle will slowly shrink to about 1/6 its size. During that time, the hair bulb will be pushed upwards towards the surface when the new hair is formed. Approximately 1 - 2 % of your hair will be in this phase in your scalp.
This is the final phase of your hair growth cycle. It is also known as the resting phase where your hair follicles will slowly fall off and replaced by a new hair. New hair starts growing in the papilla and finally the old hair falls out. Around 10 - 15 % of the hair in your scalp will be in TELOGEN phase, 50 - 100 hairs from this phase will shed daily and this period lasts for 3 months before the hair falls out. The hair follicles become weak and thin and you can easily pull them out - new hair follicle will emerge once the hair the hair falls.
The maximum length to which you can grow your hair is basically a matter of genetics and the type of care it receives. Some people can grow thick, lustrous tresses while still others find that getting their hair to grow past their shoulders is an extraordinary task. The types of hair products used (harsh chemicals, est.) can also have a tremendous effect on hair growth and length.
The frequency of trimming can as well have an effect on your hair length over a period of time. For example, if your hair averages a four-year ANAGEN phase and you have your hair trimmed one-half inch every three months, you can expect your hair to grow four inches each year, or a total of sixteen inches before it reaches the CATAGEN phase.
And the hair can appear considerably shorter depending on your wave or curl patterns. Once straightens (temporary heat straightening) hair length will be better notice. Your head size, shape and your height all can make your hair appear shorter by comparison to someone else whose hair length measures equal to yours.
Trimming your hair is important in order to keep your end healthy and even, but by using the right products in your hair and with frequent treatment, you will decrease the amount of slit end, and the need for frequent trimming though resulting in longer healthy hair.
However, if have been keeping your hair healthy and have been trying to grow it out for years and you still not getting the length that you desired, keep in mind that the maximum length you can grow your hair is base on genetics and you may not be predisposed to grow your hair as long as you'd hoped.
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