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Interdental Cleaning – Floss vs Interdental Brushes

Written by: Jon Love
Last updated: August 4, 2017 Leave a Comment

Medically Reviewed By:

Dr. Gemma Wheeler

The US federal government in 2016 removed the recommendation to floss daily, after admitting there is no scientific evidence to confirm that it works (Associated Press).

This was widely discussed within the media and has caused a lot of discussion amongst dental health professionals.

You may, feel a little cheated and be thinking why have I bothered?

Whilst the floss manufacturers may have been the ones to profit most, it is important to remember that dentists are trying to encourage better oral care and reduce the knock on effects of poor routines.

It is widely acknowledged that the best thing you can do for your oral health is to brush twice a day for 2 minutes, with the correct technique.  Using an electric toothbrush will reduce plaque and clean the teeth even more effectively.

But interdental cleaning is still important and recommended even if floss is not quite as important as we were led to believe.

When you brush your teeth with a manual or electric toothbrush, you are only cleaning 3 of the 5 sides of your teeth. Whilst the bristles of the toothbrush do reach into the gaps between teeth, their reach and cleaning effectiveness is limited.

In fact, by brushing your teeth alone you are only cleaning 60% of the tooth surface. 40% goes uncleaned unless you clean those interdental spaces.

Organisations like the British Society of Periodontology advise the use of interdental brushes.  They acknowledge that floss is of little use, unless the gap between your teeth is so tight that floss is the only option.

So, if interdental brushes are the new recommendation, what are the pros and cons and how do they compare to floss?

Interdental Brushes – Pros

  • More effective at cleaning in between the teeth – the bristles move and compress into different sized and shaped gaps than floss.
    • Removes more bacteria than florrins and toothbrushing or toothbrushing alone.
    • Resolves the symptoms of gingivitis (gum disease).
  • Different sized brushes for different sized gaps in the teeth, not a one size fits all approach like floss
  • Easier to handle and clean in between – Just a back and forth motion needed and there are handles (short and long) on interdental brushes, making it better for all, particularly those with limited dexterity.
  • Can bend the tips – Flexible brush heads make it simpler to get into gaps.
  • Only option for braces – Floss simply does not suit those who wear fixed braces, brushes clean deeper and around fittings.

Interdental Brushes – Cons

  • More expensive than floss – Require different sizes for different gaps
  • Can cut gums – If used aggressively the wire construction can cut or aggravate gums
  • Bacteria build up – Whilst they can be rinsed off and reused for about a week bacteria can build up on the bristles and then be essentially planted back in the mouth because the brush is not sterile
  • Time consuming – Getting in between all the gaps takes a lot of time.

You can learn more about interdental brushes by reading our article on the best interdental brushes.

Flossing Pros

  • Cheap – Reels of floss can be picked up for very little money
  • Fits in very small gaps – Ideally suited for gaps so tight that an interdental brush will not fit into
  • Hygienic – Disposing of the floss after use ensures the bacteria is removed

Flossing Cons

  • No proven results – The Associate Press discovered very weak evidence that it is beneficial
  • Difficult – Getting the floss in between the teeth and cleaning effectively can be very awkward, particularly for rear teeth and those with limited dexterity
  • Painful – Can cut into the gums and be unpleasant to use
  • Time consuming – Getting in between all those gaps takes a lot of time
  • Not suitable for fixed braces – Unable to manoeuvre or effectively clean when braces are worn

So is it time to bin the floss?

No, not exactly.

Not cleaning in between the teeth can lead to a buildup of plaque and bacteria between them which in turn can lead to gum disease.  

Therefore taking clear preventative steps is important.  

Where once floss was your go to option, an interdental brush is now the answer. Whilst the evidence may well be lacking for floss, it is about having the right tool for the job.

In fact, you may find this guide to the best flossing tools useful. It considers floss, interdental brushes and oral irrigators.

Ultimately, everyone’s needs are different and dentists are best placed to recommend the best approach for you.  

Jon Love

About Jon Love

Just a regular guy with a son, mortgage to pay and a dog to walk.

Having experienced the challenge of choosing an electric toothbrush back in 2014, I vowed to make it easier for others to understand and decide on a toothbrush.

I am now on a mission to simplify dental health and encourage others to smile.

Disclaimer: I am not a dentist or medical professional. Please refer to ‘Earnings Disclosure & Privacy Policy’ linked in the footer of this website.

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