Thylstrup-Fejerskov Fluorosis Index Calculator

Exact independently verified Thylstrup–Fejerskovfluorosis0–9criteria reference lookup with source, context and as-of date. Required context: actual instrument edition, surface/domain selection, independently qualified assessment, valid code mapping and authoritative reference. Caller supplies actual applicable qualified records; illustrative examples are not authoritative clinical/normative data. No default dosage, normal range, diagnosis, individual risk estimate, treatment plan or safe procedure is fabricated.

Description

The Thylstrup–Fejerskov index describes fluorosis using defined clinical criteria.

The Thylstrup–Fejerskov index describes fluorosis using defined clinical criteria.^[1]

A numerical grade needs the matching edition and qualified enamel assessment. Use this tool to retrieve a caller-supplied reference with its source context.

When to use Thylstrup-Fejerskov Fluorosis Index Calculator

Use this tool to retrieve a caller-supplied reference with its source context. Establish the qualified examination or measurement context, matching instrument/protocol edition, site order and units.

How to use Thylstrup-Fejerskov Fluorosis Index Calculator and understand its results

Establish the qualified examination or measurement context, matching instrument/protocol edition, site order and units.
Enter callerVerifiedSource, callerVerifiedContext, callerVerifiedAsOfDate, callerReferenceKeys, callerReferenceTexts, queryReferenceKey, using the field meanings and rules below, then run the tool.
Read result.matchedCallerReference, result.source, result.context, result.asOfDate. Interpret each field using the units, signs and evidence rules below.
If input validation fails, correct the reported field and run again. Before applying a successful result, check the stated reference scope, units, assumptions and any retained unknown evidence.

Input field	Meaning	Value type	Requirement
callerVerifiedSource	Caller verified source; caller assertion whose applicability must be independently established	string	Required
callerVerifiedContext	Caller verified context; caller assertion whose applicability must be independently established	string	Required
callerVerifiedAsOfDate	Caller verified as of date; real Gregorian YYYY-MM-DD date for the supplied record	string	Required
callerReferenceKeys	Caller reference keys	list of string	Required
callerReferenceTexts	Caller reference texts	list of string	Required
queryReferenceKey	Query reference key; exact key or bounded coordinate, according to the rules below	string	Required

Supply nonblank source and context strings, each at most 1024 UTF-16 units, and a real Gregorian YYYY-MM-DD as-of date in years 0001–9999. Enter nonempty aligned reference keys and texts; keys must be unique and nonblank, and texts nonblank. Select an exactly matching key, with case-sensitive matching and no trimming or normalization. The implementation returns its matched text and copies the supplied source, context and date unchanged. These verification labels are caller assertions: the tool does not fetch, verify or update a reference.

matchedText=texts[indexOfExact(queryKey,keys)]; provenance=copied caller assertions

Apply the field units and exact ordering, boundary and evidence rules above.

Output field	Meaning	Value type
result	Structured result containing the calculation or selected reference fields below	object
result.matchedCallerReference	Caller text at the exact matched reference key, returned unchanged	string
result.source	Caller source assertion copied unchanged	string
result.context	Caller applicability context copied unchanged	string
result.asOfDate	Caller date copied unchanged after Gregorian validation	string

json

{
  "input": {
    "callerVerifiedSource": "caller-independently-reviewed-source/edition",
    "callerVerifiedContext": "actual instrument edition, surface/domain selection, independently qualified assessment, valid code mapping and authoritative reference",
    "callerVerifiedAsOfDate": "2026-01-01",
    "callerReferenceKeys": [
      "record-a",
      "record-b"
    ],
    "callerReferenceTexts": [
      "Illustrative independently verified Thylstrup–Fejerskovfluorosis0–9criteria record a",
      "Illustrative independently verified Thylstrup–Fejerskovfluorosis0–9criteria record b"
    ],
    "queryReferenceKey": "record-a"
  },
  "output": {
    "result": {
      "matchedCallerReference": "Illustrative independently verified Thylstrup–Fejerskovfluorosis0–9criteria record a",
      "source": "caller-independently-reviewed-source/edition",
      "context": "actual instrument edition, surface/domain selection, independently qualified assessment, valid code mapping and authoritative reference",
      "asOfDate": "2026-01-01"
    }
  }
}

Limitations and assumptions

A successful lookup establishes an exact key match to supplied text. The tool does not obtain or authenticate the reference, confirm its applicability, or update its date.

Every listed input requires an explicit value. Unexpected fields, incorrect value types, nonfinite numbers and sparse numeric arrays fail validation; tool-specific bounds and alignment rules apply as described above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful calculation that reports a false comparison or retains unknown evidence.

Alternative or Complementary methods

Use TSIF Fluorosis Index Calculator to examine a related aspect: The Tooth Surface Index of Fluorosis describes assessed changes at tooth surfaces.

Use Dean Fluorosis Index Calculator where its separate inputs and scope apply: Dean's fluorosis categories describe qualified enamel findings.

References

Thylstrup-Fejerskov Fluorosis Index Calculator — tool.io

Similar or alternative tools

TSIF Fluorosis Index Calculator
The Tooth Surface Index of Fluorosis describes assessed changes at tooth surfaces.
Dean Fluorosis Index Calculator
Dean's fluorosis categories describe qualified enamel findings.