Toothbrush Replacement Calculator
Toothbrush Replacement Calculator: Track Your Replacement Schedule
It's easy to lose track of exactly when you last swapped toothbrushes, and worn bristles clean far less effectively. This calculator tracks the days since your last replacement against the commonly recommended 90-day interval.
The Formula
Days Used = Today − Last Replaced Date, Days Remaining = Recommended Interval − Days Used
Worked Example
Last replaced on May 1, 2026, checked on July 19, 2026, with the standard 90-day recommendation.
Days Used = 79, Days Remaining = 90 − 79 = 11 days until replacement is due
How to Use This Calculator
- Enter the date you last replaced your toothbrush.
- Optionally adjust the recommended replacement interval (90 days by default).
- Click Calculate to see how many days remain, or how overdue you are.
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Use with the Toothpaste Tube Lifespan Calculator for a complete oral care supply schedule.