Here's why:
* Hair growth is primarily controlled by genetics and hormones. These factors determine the rate at which your hair follicles produce new hair cells.
* Heat can damage hair, making it appear thinner and more prone to breakage. This can give the illusion of slower growth, but it's not actually affecting the rate of hair production.
* The "faster growth in the summer" perception is likely due to increased exposure to sunlight, leading to more shedding and hence, the appearance of faster growth as new hair replaces the shed hair.
In conclusion, while heat can influence the health and appearance of hair, it doesn't actually make hair grow faster.