RDA, or Relative Dentin Abrasivity, is a laboratory measure describing the relative abrasiveness of toothpaste against dentine under defined test conditions. It is often considered when choosing a toothpaste that removes surface deposits.
Does higher abrasivity mean better whitening?
No. Toothpaste may remove surface stains, but it does not change the natural colour inside the tooth. This distinction matters when comparing whitening products.
Brushing technique matters just as much
Even a mild toothpaste used with a very hard brush and heavy pressure may be unsuitable for gums and exposed tooth necks. Technique matters more than force.
Do you need to know the exact RDA?
Not every brand publishes this value, and it is not the only measure of toothpaste quality. If you have sensitivity, enamel erosion or gum recession, discuss toothpaste selection with a dental professional.
