Which hair type is typically the most challenging to straighten?

Curly hair is typically the most challenging to straighten due to its unique structure and natural curl pattern. The shape of the hair follicle and the distribution of keratin within the hair shaft contribute to the curls or waves, making it less pliable compared to straight or wavy hair.

When attempting to straighten curly hair, additional heat and styling products are often needed to alter its natural state effectively. This requires a higher level of skill and takes more time to achieve a smooth result without damaging the hair. Additionally, curly hair can be more resistant to the effects of straightening treatments or tools, leading to a need for repeated passes, which can further damage the hair if not done with care.

In contrast, straight hair already has minimal curl and is generally more manageable, while wavy hair, while still requiring some effort to straighten, does not showcase the same level of resistance as curly hair. Coarse hair can vary in texture and curliness, but its thickness does not inherently make it more challenging to straighten than curly hair.