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Actually, I don't know. What is interproximal? Why does it need flossing/any attention at all? Getting this information out of any dentist is usually rather difficult. It's like they think modern young people don't want to know this stuff. I am a student, but of mechanical engineering, so words like "interproximal" do not have significant meaning besides maybe picking apart their etymology. My searching online has been mostly fruitless except for that study and this forum, else I would just lookup interproximal myself. Is interproximal that area where the teeth contact each other at the top of the molars/premolars/whatever-the-hell-they're-called? Thanks for the word "interproximal"! It is a clue in this mystery of why dentists want us to floss... or is it the dental hygienists who want us to floss?
"Interproximal" means in between the neighboring teeth. This is where floss does it's work, because it is hard to get tooth brush bristles between teeth. Also "proximal contact" is just where the neighbor teeth contact each other (your contacts must be heavy hence your rough time trying to force floss between your teeth). The "interdental papilla" is the flap of gingiva (gums) that fills up the space between your teeth.
If you have healthy gums and a healthy interproximal area, you should have no BOP (bleeding on probing). Absence of BOP means that you will most likely not get periodontitis and lose your teeth.
So each tooth has five main surfaces, facial aka buccal(near the cheak or lip,), lingual (near the tongue), a Mesial(front) and Distal(back) interproximal, and an occlusal (top) surface.
Having said all that, i'm a second year dental student and floss my teeth maybe twice a week using the plackers.