The researchers found that toothbrushing at night before bed was linked to longevity. Further, healthy oral hygiene habits such as using dental floss everyday and visiting the dentist were also associated with longevity. Not seeing a dentist within the last 1 year increased mortality risk by 30–50 percent, compared with seeing a dentist two or more times.
On the other hand, the researchers found that never brushing at night increases mortality risks by 20-35 percent, compared with brushing everyday. Also, never flossing increased mortality risk by 30 percent, in comparison to flossing everyday.