Ever wondered why your toothbrush has different coloured bristles?
It turns out, they aren't just to add a splash of colour to brighten up your morning routine - and they actually serve a specific purpose.
Parents have had their minds well and truly blown over the real reason as it turns out they are 'toothpaste indicators'.
A teacher shared the discovery on her TikTok and explained that the bristles help to measure out how much toothpaste you should be using, reports Daily Star.
In a video that has gone viral, with more than 36,000 views, Jess, who lives in Ontario, Canada, showcased the dental tool to her viewers.
She asked: "Do you ever wonder why your toothbrush has different colours?
"There's a reason for that. The smallest of the colours - usually near the top, is to show you how much toothpaste you actually should be using.
"You're actually not supposed to put the toothpaste all along the brush."
Jess then points out the dark blue section of her toothbrush and says: "You should do use about a pea-size amount of toothpaste on the dark blue section here."
Children's toothbrushes also have a similar feature, she said, but the colour patch might be in at the centre rather than at the top of the brush.
She got out a kids toothbrush to showcase the difference and said: "Here's a toddler toothbrush and you can see the blue in the middle shows you exactly how much toothpaste to measure out."
Since being posted, the video has racked up more than 4,700 likes and dozens of comments from viewers who were only just finding out the truth.
One person said: "Mind blown. I was today years old." Another wrote: "No!! Never knew that!" A third commented: "So I've used 10,000% more toothpaste that I needed all my life?"
Someone else said: "Very interesting. How did you learn this? And [thank you!]," to which Jess replied saying that it was her parents that taught her it, many years ago.
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