Flossing Day
Flossing Day is held on November 29. This event in the third decade of the month November is annual. 
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When developing your oral hygiene regimen, it is important to include flossing once a day in order to decrease the likelihood of cavities and gum disease. Removal of plaque from below the gumline, which can erode tooth enamel and develop into tartar (can cause teeth discoloration) Reduce the risk of cavities. Reduces the likelihood of soreness, puffiness, and unsightly redness of the gums. Helps prevent gingivitis, which can progress to periodontitis.
The earliest iteration of modern dental floss was introduced in 1815, by a New Orleans dentist named Dr. Levi Spear Parmly. Dr. Parmly encouraged his patients to floss with a waxed silken thread after each visit.
Similar holidays and events, festivals and interesting facts
Red Planet Day on November 28 (is commemorates the launch of the Spacecraft Mariner 4 on November 28,1964);
Make Your Own Head Day on November 28
Sinkie Day in United States on November 28 (Day after Thanksgiving);
Electronic Greetings Day on November 29
Square Dance Day on November 29
You're Welcome Day on November 29
Fumigator's Day in the Dominican Republic on November 29
Stay at Home Because You are Well Day on November 30