Avoid heavy oil-based products, sulfate-containing shampoos, high-alcohol products, and heat protectants with high alcohol content.

Generally, no. Synthetic extensions and some types of human hair extensions don't need oiling. For high-quality human hair extensions, you can apply a small amount of lightweight oil to the ends if desired.

Use gentle sulfate-free shampoo, moisturising conditioner, detangle gently, mimise heat styling, protect during sleep, and schedule regular maintenance.