As a teenager, I wore the same bikini every day on holiday to ensure consistent tan lines (don't worry, I washed it with travel detergent each night).

My goal was to achieve stark white bikini lines, contrasting a deep tan – and while I now know better, the generations younger than me have adopted my love of dramatic tan lines – to the extent that the French government put out a health warning, decrying TikTok content of users giving tips on how to get halterneck tan lines, or "burn lines," primarily through sun exposure.

"These types of content, which are increasingly widespread, encourage dangerous behaviours that could seriously harm users' health," French Health Minister Yannick Neuder and Digital Minister Clara Chappaz wrote in a letter to the national watchdog last week.

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