Straightening hair only changes its appearance by temporarily altering its shape. It doesn't affect the processes happening at the scalp level that control hair growth.
In fact, excessive heat styling, including straightening, can actually *damage* the hair shaft, leading to breakage and split ends. This breakage can give the illusion of slower growth because you're losing length due to damage.
In summary:
* Hair growth happens at the root, not the ends.
* Straightening only affects the existing hair shaft.
* Excessive heat can damage hair, leading to breakage and the illusion of slower growth.