The 50-year-old actor feels straightening harmed her hair, reported Elle magazine.
"I do think I shouldn't have straightened my hair as much, let it stay curly more. I wish I had just embraced the curl," Kidman says.
One hair moment the actor regrets is in 1989 movie "BMX Bandits" as Kidman feels she looked "ridiculous" in the style.
"When I did 'BMX Bandits', they put pipe cleaners in my hair because they thought it would be like a big fashion (moment). I wish they hadn't done that to me. It was ridiculous. It did not look good." she says.
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