Written and maintained by CASRAI Editorial Board
Last updated
General product and regulatory information for clinic and supply staff. It is not medical advice and does not describe clinical technique.
Short answer
A saliva ejector is a low-volume suction mouthpiece used in dentistry to draw saliva and fluids from the mouth through tubing attached to the dental unit’s suction system. In the United States, FDA lists it under product code DYN, “Mouthpiece, Saliva Ejector”, as a Class I device under 21 CFR 872.6640. CDC notes that saliva ejectors are commonly available in disposable form.
Definition and scope
The federal regulation behind the device does not have a separate entry for the saliva ejector by name. It sits in 21 CFR 872.6640, “Dental operative unit and accessories”, which describes an AC-powered device that supplies power to, and serves as a base for, other dental devices, such as a dental handpiece, an operating light, an air or water syringe unit, an oral cavity evacuator and a suction operative unit (Cornell LII copy of the e-CFR, checked 2026-10-30).
The same regulation sets the class and exemptions: Class I (general controls), with the accessories exempt from premarket notification under part 807 subpart E, subject to the limitations in 21 CFR 872.9. The dental operative unit itself is not exempt.
FDA’s classification database (openFDA, last updated 2026-10-19) shows product code DYN for “Mouthpiece, Saliva Ejector”, review panel Dental, device class 1, regulation number 872.6640, not implanted. Legacy 510(k) records under the code exist, for example K935616 (“Saliva Ejector Disposable”, decided 1994-03-21) and K800210 (“Tongue Holder/Saliva Ejector”, decided 1980-02-06). Those records show that the code has a history; they do not identify products on the market today.
How backflow works in a saliva ejector line
CDC’s Guidelines for Infection Control in Dental Health-Care Settings (MMWR 2003;52 RR-17) places the saliva ejector in the low-volume category, distinct from high-volume evacuator tips. The guideline discusses what happens inside the line, which is the part supply and infection-control staff need.
CDC explains that backflow from low-volume saliva ejectors occurs when the pressure in the patient’s mouth is lower than the pressure in the evacuator. CDC says this can happen when a seal forms around the ejector, and that it is also possible during simultaneous high-volume evacuation. CDC adds that how often it happens varies because the quality of the seal varies between patients, that backflow is a potential source of cross-contamination, and that no adverse health effects associated with the saliva ejector have been reported.
Saliva ejector compared with a high-volume evacuator tip
| Point | Saliva ejector | High-volume evacuator tip | Source |
|---|---|---|---|
| Suction category in CDC’s guideline | Low-volume | High-volume | CDC MMWR RR-17 (2003) |
| Named in CDC’s list of items commonly available in disposable form | Yes | Yes (tips) | CDC MMWR RR-17 (2003) |
Where it matters for clinics and supply decisions
- Single-use status. CDC lists saliva ejectors among items commonly available in disposable form that should be disposed of appropriately after each use. Whether a given product is single-use is stated by its manufacturer’s labelling.
- Barriers on attachments. CDC recommends covering the handles or dental-unit attachments of saliva ejectors, high-speed air evacuators and air/water syringes with impervious barriers that are changed after each use.
- The lines behind the tip. A 1998 study in the Journal of Hospital Infection (Barbeau et al., PMID 9868623) found microbial biofilm coating the evacuation lines of dental units. Flow reversal was detected several times during use, each event lasting under 0.1 second, and bacteria were found in backflow in almost 25% of assays at 1 to 300 colony-forming units per occurrence. The authors state that this was without direct proof of cross-contamination, and that regular disinfection of the systems must be stressed.
- Regulatory status. Class I and exempt from 510(k) as an accessory, so a supplier’s product listing may cite DYN and 21 CFR 872.6640. FDA classification is not a statement about quality or fitness for a particular practice.
Related reading on CASRAI: dental surgical instruments, what a suction canister is, latex-free dental dam labelling, and the dental office emergency supply checklist. For how another suction-adjacent category is classified, see ENT surgical instruments and FDA classification.
Common misunderstandings
“It is a separate FDA-regulated product with its own regulation.”
FDA’s product code DYN is specific, but the regulation is the shared 21 CFR 872.6640 for the dental operative unit and its accessories.
“Class I means no safety concern.”
Class I means general controls apply. CDC still addresses saliva ejectors specifically for backflow, single-use handling and barriers.
“Backflow has been shown to harm patients.”
CDC states that no adverse health effects associated with the saliva ejector have been reported, while advising practitioners to be aware that backflow could occur in certain situations. The 1998 study likewise reports no direct proof of cross-contamination.
“A saliva ejector and a high-volume evacuator are the same thing.”
CDC treats them as low-volume and high-volume categories with different items, as in the table above, and it names saliva ejectors and high-volume evacuator tips separately.
FAQ
What are saliva ejector uses?
It is a low-volume suction device for removing saliva and fluids from the mouth in dental settings, connected to the dental unit’s suction system. FDA groups it with accessories to the dental operative unit, which includes an oral cavity evacuator and suction operative unit in the regulation text.
Is a saliva ejector single-use?
CDC says saliva ejectors are commonly available in disposable form and should be disposed of appropriately after each use. The product’s own instructions or labelling govern the specific item.
Is a saliva ejector an FDA-regulated medical device?
Yes. FDA lists it as product code DYN, Class I, under 21 CFR 872.6640, with accessories exempt from premarket notification subject to 21 CFR 872.9.
What is backflow in a saliva ejector?
Fluid moving back toward the mouth when the pressure in the mouth is lower than in the evacuator, which CDC identifies as a potential source of cross-contamination.
Sources
- 21 CFR 872.6640, Dental operative unit and accessories, via Cornell LII e-CFR, checked 2026-10-30.
- FDA openFDA device classification, product code DYN, api.fda.gov, data last updated 2026-10-19, checked 2026-10-30; 510(k) records K935616 and K800210.
- CDC, Guidelines for Infection Control in Dental Health-Care Settings, 2003, MMWR 2003;52(RR-17), checked 2026-10-30.
- Barbeau J, ten Bokum L, Gauthier C, Prevost AP. Cross-contamination potential of saliva ejectors used in dentistry. J Hosp Infect 1998;40(4):303-11. PubMed 9868623, checked 2026-10-30.
