Use actual observed counts
The checked up&up4pack at$1.99 equals$0.4975 per complete manual brush. Oral-B’s2heads at$18.99 equals$9.495 per refill head. Round only after division.
Keep differences visible
A lower complete-brush ratio does not prove a better clinical choice than a powered system or establish compatibility. Compare replacement heads with other confirmed compatible heads, and manual packs with their actual contents.
Include payable conditions
Shipping, tax, subscription and promotions can change the actual cost. Enter the obtainable amount and keep its conditions visible. We do not claim a completed purchase or verified historical saving.
A practical check to keep
The tool accepts zero actual price as arithmetic, but a free promotional pack still has its own eligibility and delivery conditions. A gift-card reward is not silently subtracted from an unconditional product price. When comparing delivered totals, use the same cost scope in every row and keep manual brushes separate from head-only refills.
Before you decide
- Keep the full model and age statement
- Confirm item type and pack count
- Follow actual product directions and refresh the offer
Sources & scope
Checked November 4, 2026. ADA, AAPD and manufacturer/retailer references support the specific statements. Dated displayed prices are not final checkout quotes, performance rankings or individual product clearance. This shopping reference does not replace the product label or individual dental advice.