Annual cost depends on a fitting head, current pack price, pack count and replacement interval.
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What matters for this question
- Divide a current pack price by its verified head count for unit cost. Then estimate how many heads each person uses from the replacement interval.
- Whole-pack spending can exceed annual consumption cost because the next purchase leaves spare heads. The calculator shows both figures.
How to apply it
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For a household, annual use can be a fractional number of heads, but stores sell whole packs. The calculator therefore reports both consumption value and rounded whole-pack spending. Leftovers carry forward; taxes, shipping, subscriptions and price changes are not included.
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Sources and scope
- ADA toothbrush and replacement guidance · dental professional organization; web full text; retrieved 2026-10-31