this post was submitted on 02 Jun 2024
65 points (95.8% liked)

Today I Learned (TIL)

6567 readers
1 users here now

You learn something new every day; what did you learn today?

/c/til is a community for any true knowledge that you would like to share, regardless of topic or of source.

Share your knowledge and experience!

Rules

founded 2 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
[–] [email protected] 4 points 5 months ago* (last edited 5 months ago)

It's MICRO plastic, literally too small for you to see. If you look at a new tooth brush under a microscope compared to a used one there are very clear signs of wear.

Electron microscope view: https://www.medicaldaily.com/pulse/after-you-brush-your-teeth-3-months-what-your-toothbrush-looks-why-you-need-replace-361258