| ▲ | Piezoelectric toothbrush reduces plaque(science.org) | |
| 14 points by Gaishan 2 days ago | 1 comments | ||
| ▲ | xenospn a day ago | parent [-] | |
TIL we have been using the same basic toothbrush design for over 1100 years! | ||
| ▲ | Piezoelectric toothbrush reduces plaque(science.org) | |
| 14 points by Gaishan 2 days ago | 1 comments | ||
| ▲ | xenospn a day ago | parent [-] | |
TIL we have been using the same basic toothbrush design for over 1100 years! | ||