04/08/2026
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Most people think the morning brush is the most important. Research suggests the bedtime brush may matter even more.
During sleep, saliva production naturally decreases, reducing the mouth's ability to wash away plaque and bacteria. As a result, dental plaque can remain undisturbed for hours, creating an environment that may promote bacterial growth and inflammation.
In a study published in Scientific Reports, researchers examined whether the timing of toothbrushing was associated with cardiovascular outcomes. People who brushed their teeth before bed—whether or not they also brushed in the morning—had a significantly lower risk of cardiovascular events than those who skipped nighttime brushing. Interestingly, brushing only in the morning did not show the same association.
The researchers suggest that removing dental plaque before sleep may help reduce the overnight bacterial burden. Because this was an observational study, the findings show an association rather than proving cause and effect.
Brushing before bed takes only a few minutes, yet it remains one of the simplest evidence-based habits for protecting oral health—and it may also support overall health.
Reference:
Isomura ET, Suna S, Kurakami H, et al. Not brushing teeth at night may increase the risk of cardiovascular disease. Scientific Reports. 2023.
