Search interest for “foam hair dye” is currently at a 15-year high. TikTok viral brands like Punky Colour and Hally Hair make semi-permanent hair dyes that are easy to apply.

That may explain the 34-year-old’s newfound interest in hair color. Kelce is an “ambassador” for Rewind It 10, a new men’s hair- and beard-dye brand co-founded by rapper Fat Joe.

If you apply the dye throughout your hair without actually knowing how it’s going to process or oxidize, your at-home color experiment could end quickly in disappointment, Connor notes.

Breast cancer does seem to be associated with permanent hair dye, though, Dr. White said. In a 2019 study involving more than 46,000 women, Dr. White and her colleagues found that those who used ...