An endocrinologist and a dermatologist share why hair texture changes, and what—if anything—you can do about it.

This season, it's all about the "Ariel waves" hair trend, which involves sultry, flowing curls with loose, undone texture.

“When creating waves and curls, it’s important that the iron glides smoothly through the hair,” says Maine. “Even the best flatirons can struggle on rough or dry hair.” Because of ...