All you need to carry out the hack, which people are calling “genius”, is a lint roller.
Brunette beauty Andrea Lopez took to the social media site to share a video about the hack.
She was seen saying: “Ladies, if you want to find out if your man is cheating on you get yourself one of these and roll it all over their carpet like this.”
And after using the lint roller across the entire carpet, Andrea held it up to the camera.
It appeared to show several strands of hair in an auburn shade.
Andrea, who has black hair, exclaimed: “What the f***k.”
Captioning the video, she added: “He has some explaining to do”.
In a follow up clip, Andrea is seen bursting into the bathroom to confront her boyfriend.
She asked him: “Isaac, why the f*** was there red hair in your room?”
Fellow TikTok users seemed to find the video hilarious, with one commenting: “I guess everyone is single after this, huh?”
While another added: “Why didn’t I think of this before?”
A third joked: “Lint rollers gonna be harder to get than toilet paper during COVID.”
Other social media uses suggested using the lint roller on a bed or sofa for those who don’t have a carpet in their home.
Many followers did point out that the hair could belong to a relative, or someone who might have very innocently visited the house. Others also suggested it could be pet hair.
Other social media users also said the trick wouldn’t work if the other person had the same colour hair.