RDA (Relative Dentin Abrasivity) measures how gentle or rough a toothpaste is on the teeth during brushing. In general, the higher the number, the greater the potential for tooth wear over time.

This is especially important for people with:

• Gum recession or exposed roots

• Sensitive teeth

• Acid erosion (acidic drinks, reflux/GERD, etc.)

• Existing tooth wear

• Aggressive brushing habits

In general, lower-abrasive toothpastes (RDA 0–70) are often preferred for long-term tooth preservation, especially in patients at higher risk for wear and erosion.

RDA Abrasivity Ranges:

0–70 → Low abrasive

71–100 → Medium abrasive

101–150 → Highly abrasive

151–250 → Regarded as harmful limit

Whitening toothpastes are often more abrasive than regular toothpaste.