Yes, curly human hair extensions can be straightened and then return to their natural curls, but it depends on the hair quality and how it’s treated. High-quality
curly human hair extensions, especially those made from virgin or raw hair, have strong curl patterns that can revert after straightening. To maintain the integrity of the curls, use a heat protectant before applying heat and set your flat iron to a low or medium temperature.

After straightening, restoring the curls requires proper hydration. Wash the extensions with a shampoo without sulfate and follow with a deep-conditioning treatment. Scrunch the hair while damp and let it air dry or use a filter to enhance the curls. If the curls don’t bounce back completely, try using a curl-defining mousse or leave-in conditioner to encourage the natural pattern.
Repeated heat styling can loosen curl definition over time, so it’s best to minimize straightening and always follow up with nourishing treatments to keep your curly human hair extensions long-lasting, silky, and bouncy.