When needed for their role, actors often accept multiple hair treatments and chemicals that eventually cause damage, just ask Tom Felton or Ariana Grande.
Ward-Hammond went on to explain that this experience caused her to straighten her hair for every audition so it wouldn’t be an issue.
As auditions picked up, she had her hair pressed so often that it began to fall out.
However, agreeing to a color treatment to become the character you’ve booked is completely different than styling your hair in a damaging way for auditions because your natural hair may be a deterrent if no one on set knows what to do with it.