The 2021 IADR/AADR/CADR General Session & Exhibition is now a 100% Virtual Experience!


Home  /  About Us  /  News

For all media inquiries, or for more information about the AADR, please contact:

Elise Bender
Marketing & Communications Manager

Stay up to date on the latest news at AADR by reading our press releases. Use the search and keyword features on the left to sort past press releases. 

Study Finds Flossing Associated With Lower Risk of Tooth Loss Over 5 Years and 10 Years

Alexandria, VA, USA – At the 95th General Session & Exhibition of the International Association for Dental Research (IADR), researcher Julie Marchesan, University of North Carolina, Chapel Hill, USA “Flossing is Associated With Disease Prevalence and 10-year Tooth Loss.” The IADR General Session was held in conjunction with the 46th Annual Meeting of the American Association for Dental Research and the 41st Annual Meeting of the Canadian Association for Dental Research.

In this study, Marchesan sought to estimate the prevalence of disease and 10-year tooth loss among flossers and non-flossers.  To accomplish this three population studies using random sampling methods were analyzed: NHANES-2009-14 (n=10,513), Dental Atherosclerosis Risk In Communities (DARIC) (n=6,653), and Piedmont 65+dental study (PDS) (n=419). All studies used standardized examiners. Outcome measurements used were extent of interproximal clinical attachment levels (iCAL)≥3mm and interproximal probing depth (iPD)≥4mm. Tooth loss was available by a 10-year follow-up questionnaire in DARIC and 5-year tooth loss was calculated based on exam for PDS. Demographics, flossing (numbers of times/week) and brushing (number of times/day) data were collected via questionnaire. General linear models (SAS-proc GLM) and hazard ratios (PROC-GENMOD) were used. All analysis presented include adjustment for age, race, gender, diabetes, smoking and education.

Marchesan found DARIC flossers had lower mean extent of sites with iCAL≥3mm compared to non-flossers [22.0% (SE=0.33) vs 26.7% (0.45) sites, p≤0.0001]. NHANES findings showed similar pattern with flossers having iCAL≥3mm [20.0% (0.28)] compared to non-flossers [29.5% (0.42) sites, p≤0.0001]. Stratifying by number of times brushed/day, we found that DARIC participants who flossed ≥1X/week and brushed 0-2X/day showed lower levels of clinical measurements compared to non-flossers (iCAL≥3mm and iPD≥4mm). The relative risk for 10-year tooth loss in DARIC showed that non-flossers had a 1.25 (1.03-1.52) excess risk for loosing ≥3 teeth. Similar data in the PDS for 5-year risk of tooth loss showed that non-flossers had a 3.23 (1.82-5.74) excess risk of losing ≥3 teeth. Based on the above results, Marchesan concluded flossing was associated with lower extent of iCAL and iPD even in the presence of brushing 1-2 times/day. Flossing was associated with lower risk of tooth loss over 5 years and 10-years.

This is a summary of abstract #3651 titled “Flossing is Associated With Disease Prevalence and 10-year Tooth Loss”, presented by Julie Marchesan Saturday, March 25, 2017, 2 p.m. – 3:30 p.m. at Moscone West, San Francisco, Calif., USA. 

About the International and American Associations for Dental Research
The International Association for Dental Research (IADR) is a nonprofit organization with nearly 11,000 individual members worldwide, dedicated to: (1) advancing research and increasing knowledge for the improvement of oral health worldwide, (2) supporting and representing the oral health research community, and (3) facilitating the communication and application of research findings. To learn more, visit
Previous Article Study Finds Subgingival Microbiome and Periodontal Disease Link
Next Article Electronic Cigarette Risk-for-Harm to Subgingival Microbiota May be Similar or Greater Than Smoking

Theme picker