Adults with type 2 diabetes who clean between their teeth at least three times a week may have more stable 24-hour blood glucose levels, new research shows.
A clinical study, published in advance in the American Diabetes Association’s journal Diabetes Spectrum, found that adults who flossed or used interdental brushes three or more times weekly spent more time within the healthy glucose range (70–180 mg/dL). Those with 20 or more natural teeth also recorded lower average glucose levels throughout the day.
Using continuous glucose monitoring (CGM) sensors over 14 days, researchers tracked the blood sugar patterns of 104 adults with type 2 diabetes and surveyed their oral care routines.
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Participants who cleaned between teeth at least three times weekly showed higher “time in range” scores, lower fasting glucose, and reduced glucose management indicators — all signs of steadier blood sugar control. More frequent dental visits and twice-daily brushing were also associated with healthier metabolic and inflammation markers.
The findings build on earlier evidence linking periodontal treatment to lower HbA1c levels, reinforcing the role of daily oral hygiene in managing diabetes.
The joint study was conducted by Japan’s Sunstar Group, Clinic Masae Minami, and the Minami Diabetes Clinical Research Center.