Written and maintained by CASRAI Editorial Board
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This page describes products and general use; it is not medical advice.
A dental prophy cup is the small rubber cup that sits on a dental handpiece and carries polishing agent to the teeth during prophylaxis (cleaning). It is a regulated Class I device in the United States, and the regulation defines it as a rubber device held by a dental handpiece.
What a dental prophy cup is
Under 21 CFR 872.6290, a prophylaxis cup is “a device made of rubber intended to be held by a dental handpiece and used to apply polishing agents during prophylaxis (cleaning).” The handpiece spins the rubber cup holding the polishing agent, and the user applies it to the teeth to remove debris (eCFR, 21 CFR 872.6290, checked 2026-10-31).
Who uses it: dental clinicians performing prophylaxis, and the staff and buyers who stock the operatory.
How it is built and how it works
The regulatory definition names three things: a rubber cup, a dental handpiece that holds and spins it, and a polishing agent carried in the cup. The cup is the part that touches the tooth surface. The handpiece supplies the rotation, and the agent does the abrasive or polishing work. Related pages cover the polishing paste that goes in the cup and the prophy angle, the handpiece attachment that carries it.
Regulatory identity: FDA class, code EHK and 21 CFR 872.6290
| Item | What the record states | Source |
|---|---|---|
| FDA device name | Cup, prophylaxis | FDA Product Classification database and openFDA, checked 2026-10-31 |
| Product code | EHK | FDA Product Classification database, checked 2026-10-31 |
| Regulation | 21 CFR 872.6290 (Dental specialty) | eCFR, checked 2026-10-31 |
| Device class | Class I (general controls) | 21 CFR 872.6290(b) |
| Premarket notification | Exempt from the 510(k) procedures in subpart E of part 807, subject to the limitations in 21 CFR 872.9 | 21 CFR 872.6290(b) |
| Quality management system | If not labeled or otherwise represented as sterile, exempt from the quality management system regulation (part 820) except records and complaint-file requirements under 21 CFR 820.35 | 21 CFR 872.6290(b) |
What the sterile-label condition means
The quality management system exemption applies only when the cup is not labeled or otherwise represented as sterile. A cup sold as sterile does not get that exemption from the regulation’s text. Reading a product label for a sterile claim is therefore the way to tell which regulatory condition applies to it.
Cup, angle, paste and handpiece: where each sits
The regulation defines the cup as the rubber part held by the handpiece. It is not the handpiece, not the polishing agent, and not the angle that links the two. Each of those is its own product with its own page here: the disposable prophy angle, dental polishing paste and the dental air polisher, which polishes by a different mechanism.
Safe use and handling basics
Use the manufacturer’s instructions for use for the specific product. Those instructions, not a general page, say whether a cup is single-use or reusable, how it attaches and how it is stored. Infection-control practice in dental settings is set by CDC guidance and local regulation, and clinical technique belongs to the treating clinician.
Common mistakes
- Treating “prophy cup” as a synonym for the whole prophy angle. The regulation describes the cup as the rubber device held by the handpiece, and the angle is separate.
- Assuming a cup is sterile because it is packaged. Sterility applies only where the product is labeled or represented as sterile.
- Assuming Class I means no regulatory requirements. General controls and the records and complaint-file requirements in 21 CFR 820.35 still apply as stated above.
FAQ
Is a dental prophy cup a medical device?
Yes. FDA lists it as “Cup, prophylaxis”, product code EHK, a Class I device under 21 CFR 872.6290 in the Dental specialty (FDA Product Classification database, checked 2026-10-31).
Does a dental prophy cup need 510(k) clearance?
No. 21 CFR 872.6290(b) exempts it from the premarket notification procedures in subpart E of part 807, subject to the limitations in 21 CFR 872.9.
Is a prophy cup the same as a prophy angle?
No. The regulation describes the cup as the rubber device held by the dental handpiece. The disposable prophy angle is a separate product, and the cup is used with dental polishing paste.
Sources
- eCFR, 21 CFR 872.6290 Prophylaxis cup: ecfr.gov (checked 2026-10-31).
- FDA Product Classification database, product code EHK: accessdata.fda.gov (checked 2026-10-31).
- openFDA device classification endpoint, product code EHK: api.fda.gov (checked 2026-10-31).
