Study: Brushing Teeth Linked to Healthy Weight A new study published in a Japanese journal on obesity concludes that encouraging people to brush more could help prevent obesity. Brushing itself doesn't burn that many calories. But a study of nearly 4,000 people by Japanese researchers found that brushing three times a day was linked to being slender. And brushing much less was often linked to obesity. Researchers say regular brushing shows you care about appearance and health and that translates to a lower weight.