The upper eyelid has approximately 90-150 eyelashes on it, while the bottom has between 70 – 80 eyelashes. Most eyelashes grow to be about 10mm long, just over 3/8 of an inch.
Even though it may not seem like it, every hair on your body has a growth cycle. It will grow to a specific length and eventually reach its full cycle, and then fall out. There are three phases to all hair growth cycle, even eyelashes:
1. Active Growth Phase - Roughly 40% of the upper eyelashes are in active growth at any one time. This phase lasts 30 to 45 days.
2. Transitional Phase - During this phase, the eyelash stops growing and the follicle shrinks. This lasts 2 to 3 weeks.
3. Resting Phase - This phase can last over 100 days before the eyelashes fall out.
Important Note: Each individual eyelash is in its own cycle so there are some lashes in each phase at all times. As a result, most days at least a few eyelashes will fall out.
Yes they do, but it might take a couple of months before you see them especially if you have interrupted the natural growth cycle in some way. For example, if you pull your eyelashes out, you will be without any visible eyelashes for a while before they grow back and get to the resting phase.
If you have been pulling your eyelashes out, the hair still has to finish its growth cycle. A new one will not grow in any faster, since the other hair was prematurely removed. Thus, potentially creating a less than full look for a while.
When you are wearing extensions, it's important not to pull or tug at them and put your natural lashes at risk.
However, do not fear. There are some excellent lash serums to help nurse your natural lash health back into shape!
Realistically, eyelash extensions last 4 weeks, give or take a couple of weeks, falling out with the natural lash. Some will be lost within a couple of weeks as part of the natural cycle, so it is commonly required to get a refill every 2 to 3 weeks to maintain them.
Understanding the growth cycle of an eyelash is helpful to know. Since it's impossible to know which natural lash hairs are in which stage of the growth cycle, you should continually expect natural shedding to occur.