What can be a long-term effect of improper application of braid extensions?

The long-term effect of improper application of braid extensions that is most notable is traction alopecia. This condition results from consistent tension on the hair follicles due to tight braiding or the weight of the extensions, leading to hair loss. Over time, the sustained stress on the hair can cause the follicles to weaken and eventually cease producing hair altogether.

In contrast, the other options do not align with the negative consequences of improper braid extension application. Thicker hair growth and improved texture are not realistic outcomes of using extensions incorrectly; instead, they are expectations when applied and maintained properly. Healthy hair retention is also compromised by improper application, as the tension can lead to breakage and loss, rather than promoting overall hair health.