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Relative Dentin Abrasivity

Everyone likes a dazzling smile, and so modern toothpaste is made with small polishing particles which help to scrub our teeth clean of stains. But too much of a good thing could affect your dentin: the layer of bony tissue which sits beneath the much stronger enamel and forms the bulk of a tooth.

Relative Dentin Abrasivity testing gives manufacturers the opportunity to assess the level of stain removal and tooth whitening against potential damage to dentin, which can become sensitive if exposed to too much polishing.

Abrasivity is the measure of the action of the toothpaste - or in our case tabs - on the surface of your teeth. These products use sodium bicarbonate to gently polish the teeth. Sodium bicarbonate also increases the alkalinity levels inside our mouths, which helps keep the breath fresh. Dental experts tested each tab on extracted human teeth to measure the level of abrasivity on the teeth - and this in vitro test was performed in accordance with International Standard ISO11609.

Publishing the results allows you to make an informed choice about which toothy tabs and powders suit your lifestyle and your mouth.

The RDA scale rates dental products numerically: the higher the number, the higher the abrasivity.



Low level of abrasivity - gives a gentle polish.


Medium level of abrasivity - gives a medium weight polish.


High level of abrasivity - more intensive polish.

Over 150

Very high level of abrasivity - can be harmful.


Lush toothy tabs were graded accordingly and results can be seen below.




RDA test score



Boom! toothy tabs


Medium abrasivity


Dirty toothy tabs


Low abrasivity

Comments (4)


about 4 years ago

How would these tooth powders compare to the likes of Aquafresh etc? Would they be the same dental quality as commercial toothpastes?

about 4 years ago

Hi, I really wanted to know about the RDA test scores of the tooth powders. Thank you.


about 4 years ago

Hi lush. I have a question for you : what about the RDA score for Ultrablast and Atomic ? When I start to use them everyday (twice a day), my teeth get a funny feeling, as if they were sensitized. Maybe I should use Miles of miles for an everyday use ?

about 4 years ago

Hi! You have written the results of the toothy tabs but what about the tooth powders?