FDA PRODUCT CODE · CLASS II
PHR — Diammine Silver Fluoride Dental Hypersensitivity Varnish
Applied to tooth enamel to block dentinal tubules for the purpose of reducing tooth sensitivity.
What these counts are not
Clearance and recall counts are SPEQ’s aggregation of FDA’s own published records for the code. A recall count is a measure of history, not of a device’s safety, neither number is an FDA rating, and SPEQ is not affiliated with the FDA.
What this classification requires
Every statement below is FDA’s own classification record for this product code, quoted from the device classification field reference. The SPEQ reading beneath each one is SPEQ’s interpretation of what it means for the work, and is not FDA text.
510(K)
SPEQ READINGA premarket notification under 21 CFR Part 807 Subpart E is the route for this code. The submission argues substantial equivalence to a legally marketed predicate, so the engineering question is which predicate the design can actually be compared against, and the evidence question is what testing supports that comparison.
Class II (moderate to high risk): general controls and special controls
SPEQ READINGSpecial controls are the distinguishing feature: performance standards, guidance documents, patient registries or postmarket surveillance named for the device type. Find the special controls before designing the test plan — they usually name the tests.
Device is eligible for The Voluntary Malfunction Summary Reporting Program
SPEQ READINGMalfunctions for this code may be reported in periodic summary form rather than as individual MDRs under 21 CFR Part 803. Eligibility is a property of the product code; using it is a decision the manufacturer makes and must be able to justify.
Not exempt due to Good Manufacturing Practice (GMP)/Quality System
SPEQ READINGThe full Quality Management System Regulation (21 CFR 820, incorporating ISO 13485:2016) applies, and is what an FDA inspection of this device will be conducted against.
Device is not implantable
SPEQ READINGNo implant-specific expectations attach from the classification itself.
Device is not used for life sustaining purposes
SPEQ READINGNo life-sustaining designation attaches to this code.
Device is a candidate for a third party review program
SPEQ READINGAn Accredited Person may conduct the 510(k) review instead of FDA. FDA still makes the clearance decision — third-party review changes who reviews, never who decides.
Other product codes under 21 CFR 872.3260
One regulation usually governs several product codes. These share this code’s regulation, and therefore its classification basis.
21 CFR 872.3260 — Cavity varnish
The classification regulation for this product code, as published by the Office of the Federal Register. This is the regulation text itself — no SPEQ interpretation appears in it.
(a) Identification. Cavity varnish is a device that consists of a compound intended to coat a prepared cavity of a tooth before insertion of restorative materials. The device is intended to prevent penetration of restorative materials, such as amalgam, into the dentinal tissue.
(b) Classification. Class II (special controls). The device, when it is an external cleaning solution, is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 872.9. [52 FR 30097, Aug. 12, 1987, as amended at 84 FR 71812, Dec. 30, 2019]
Source: Electronic Code of Federal Regulations, Title 21. 21 CFR is a work of the United States Government and is in the public domain. SPEQ read this section on October 22, 2026. CFR is amended continuously, so verify against the source before acting on it: read 21 CFR 872.3260 on eCFR →
Recent clearances
Source: FDA device classification, 510(k)/PMA, and recall datasets. Recall entries count distinct FDA recall numbers, so one recall event affecting several products appears as several entries. Browse every product code SPEQ tracks →