Which process in hair care helps to prevent split ends?

Regular trimming is essential in preventing split ends because it removes the damaged and frayed tips of the hair. Split ends occur when the protective outer layer of the hair cuticle wears away, leading to splitting or breakage along the strands. By trimming the hair regularly, individuals can eliminate these damaged ends before they worsen, thus maintaining healthier hair overall.

While deep conditioning, using less heat, and applying hair oil can contribute to improving the health and hydration of hair, they don't directly address split ends in the same way that regular trimming does. These methods can reduce the likelihood of damage and improve overall hair condition, but they do not repair hair that has already split or prevent future splits if some ends have already become damaged. Regularly trimming hair is, therefore, the most effective way to manage and prevent split ends, ensuring hair looks healthy and is less prone to further damage.