| ▲ | prodigycorp 2 days ago | |
Perhaps there's a selection effect where people who buy electric toothbrushes are pre-disposed to care more about dental health. | ||
| ▲ | helsinkiandrew a day ago | parent [-] | |
No, I would think all trials are random with people assigned brushes > 5068 participants were randomised to receive either a powered toothbrush or a manual toothbrush. Majority of the studies included adults, and over 50% of the studies used a type of powered toothbrush https://www.cochrane.org/evidence/CD002281_poweredelectric-t... | ||