Description
Count calendar days since a toothbrush head's recorded first use.
Dental records depend on surface notation, assessed and excluded denominators, missing versus observed zero, reporting quanta and recorded equipment dates. Calendar-day counts can be elapsed or inclusive, and nominal expiry comparisons do not establish sterility. Local surface fractions and source labels are not automatically validated clinical indices.
Count calendar days since a toothbrush head's recorded first use.
When to use this tool
Use Toothbrush Head Use Day Count when you already have firstUseDate, asOfDate, countFirstDay and need to count calendar days since a toothbrush head's recorded first use.
How to use the tool and how it works
- Enter firstUseDate, asOfDate, countFirstDay. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read useDays. Use the output convention below.
Parse real UTC dates and require asOf>=firstUse; return elapsed days plus one when countFirstDay=true.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| firstUseDate | First Use Date | Required. Text; maximum UTF-16 length 8192. Real proleptic Gregorian YYYY-MM-DD; four-digit years 0000-9999 accepted. |
| asOfDate | As Of Date | Required. Text; maximum UTF-16 length 8192. Real proleptic Gregorian YYYY-MM-DD; four-digit years 0000-9999 accepted. |
| countFirstDay | True adds one inclusive day; false reports elapsed days since first use. | Required. Boolean. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| useDays | Use Days | Required. Safe integer. |
{
"input": {
"firstUseDate": "2026-10-01",
"asOfDate": "2026-11-01",
"countFirstDay": true
},
"output": {
"useDays": 32
}
}Limitations and assumptions
- The first date gives zero elapsed days or one inclusive day as selected. No actual use, wear, hygiene, replacement interval or safe condition is assessed.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
Alternative or Complementary methods
Use original chart, observation and reprocessing records with the complete scoring or controlled workflow. Keep denominator, missingness and date conventions explicit; local arithmetic does not determine oral-health status, appropriate recall intervals or readiness for care.
References
Similar or alternative tools
- Dental Instrument Pack Expiry
Compare a recorded instrument-pack expiry with a planned-use date.
- Floss Use Diary Recall Interval
Measure a floss-use report date's signed gap from a recorded event date.