Quick facts
- United States: a night guard is listed in the FDA device classification database under one of three mouthguard product codes — OBR for an over-the-counter guard, MQC for a prescription guard, and OCO for a migraine and tension headache guard.
- United States: all three codes are unclassified. They carry no regulation number, which separates a night guard from dental floss and most other dental devices that sit in named Class I entries.
- United States: the OBR definition states the purpose plainly — to protect the teeth and reduce damage from bruxing or nighttime grinding, and to reduce the noise associated with it.
- Canada: a removable appliance placed in the oral cavity as far as the pharynx is Class I under the Medical Devices Regulations, Schedule 1, Rule 2(2).
- Canada: the same appliance moves to Class II if it is a denture material or an orthodontic appliance, or an accessory of either, because Rule 3(a) places all of those in Class II.
- Both countries: an over-the-counter boil-and-bite guard and a laboratory-made custom guard are the same device class; what differs is who takes the impression and who carries the fit.
A night guard is bought for a bruxism diagnosis and sold as a small plastic appliance, and that combination is why its regulatory position surprises people. In the United States it does not sit in a numbered regulation at all; it sits under an unclassified product code. In Canada it does sit in a class, and the class depends on whether the appliance is a plain oral protector or an orthodontic or denture accessory. This article sets out both positions, the product forms that change the class, and the records a practice should hold for a custom or an over-the-counter guard.
How do Canada and the United States classify a night guard?
The United States classifies the guard by the mouthguard product code it falls under. The FDA classification database lists an over-the-counter mouthguard under code OBR, a prescription mouthguard under code MQC, and a migraine and tension headache mouthguard under code OCO. Each of the three is unclassified, and none of them carries a regulation number. That is unusual for a dental product: dental floss, for example, sits in 21 CFR 872.6390 as a named Class I entry, while a night guard does not sit in a numbered section at all.
The OBR definition is worth quoting because it describes a bruxism appliance directly: the device is intended "to protect the teeth and reduce damage caused by bruxing or nighttime grinding and prevention of the noise associated with bruxing and grinding." A practice that submits a guard for a bruxism indication is therefore working inside a code that already states that purpose, rather than stretching a tooth-protection entry to cover it.
Canada reaches the class by rule. A removable appliance that is placed in the oral cavity as far as the pharynx is a device described in Rule 2(1) — an invasive device that penetrates the body through a body orifice — and Rule 2(2) places it in Class I. Rule 3 then carves out the cases that change the answer: "all denture materials and orthodontic appliances, and their accessories, are classified as Class II." A plain occlusal guard is Class I; a guard that is also an orthodontic appliance or a denture accessory is Class II.
| Item | Canada | United States |
|---|---|---|
| Named entry | Rule 2(2) for an oral cavity appliance | Product codes OBR, MQC, OCO |
| Regulation number | Rule-based, no section number | None; the codes are unclassified |
| Class | Class I for a plain guard; Class II if an orthodontic or denture accessory | Unclassified |
| Premarket submission | Device licence required for Class II; not for Class I | Determined by the product code and the applicable requirements |
| Prescription guard | Same class route; the prescription does not change the class | Product code MQC |
| Over-the-counter guard | Same class route | Product code OBR |
What changes the class in Canada and how does that differ from the United States?
The line between Class I and Class II in Canada runs through Rule 3(a), and it is drawn by what the appliance is rather than by how it is made. A custom-milled guard and a boil-and-bite guard made from the same resin are both Class I if they are simple oral protectors, because Rule 2(2) reaches appliances placed in the oral cavity as far as the pharynx. The moment the same appliance is characterised as an orthodontic appliance, or as a denture material or an accessory of one, Rule 3(a) raises it to Class II.
The practical result is that the material specification and the intended-use statement decide the class together. A guard described as a bruxism protector is Class I; a guard described as part of an orthodontic treatment or as a prosthetic accessory is Class II, and a Class II device in Canada needs a device licence before it is sold. A practice that orders a guard from a laboratory should therefore be able to say which description the appliance carries, because that description is the classification.
| Product form | Canadian class | United States code and class |
|---|---|---|
| Custom occlusal guard, bruxism indication | Class I, Rule 2(2) | OBR or MQC, unclassified |
| Over-the-counter boil-and-bite guard | Class I, Rule 2(2) | OBR, unclassified |
| Orthodontic appliance or accessory | Class II, Rule 3(a) | Classified with the orthodontic device |
| Denture material or denture accessory | Class II, Rule 3(a) | Classified with the denture device |
| Guard for migraine or tension headache | Class I unless Rule 3(a) or Rule 2(3) applies | OCO, unclassified |
How does the 30-day rule affect an orthodontic appliance?
Rule 2(3) is the provision most often misread. It places a device described in Rule 2(1) in Class III if it is "normally intended to remain in the body or in contact with the surface of the eye for at least 30 consecutive days." The phrase that matters is in the body. A removable guard that a patient takes out for meals and cleaning is not intended to remain in the body for 30 days, so Rule 2(3) does not reach it. A fixed orthodontic appliance that is cemented in place for a treatment period is a different question, and that is why the fixed and removable cases should not be described by the same sentence in a file.
For a removable night guard, the operational consequence is simple. The appliance is Class I under Rule 2(2) unless Rule 3(a) raises it, and the 30-day provision is not engaged by a device that is designed to be removed. The record should state that the appliance is removable, because that single word is what keeps Rule 2(3) out of the analysis.
What should a practice record for a night guard order?
Five records, each tied to a requirement.
- The intended-use statement. The words supplied to the patient and to the laboratory, since that statement is what decides the US code and the Canadian rule.
- The product form. Custom or over-the-counter, and removable or fixed, because removable keeps Rule 2(3) out.
- The material specification. The resin used, and whether it is described as a denture material or an orthodontic accessory, which is the Rule 3(a) trigger.
- The prescription record. For code MQC and for any prescription guard, the written order that supports the guard as a prescribed appliance.
- The fit and remake record. The impression date, the fit check and the remake history, because a guard that does not fit is the failure that returns to the practice.
Which consumables sit beside the night guard line on a dental order?
Dental consumables are ordered as a cycle, and the night guard line travels with the impression, isolation and tray consumables that share the same case. For practices buying at case level, the wholesale ordering page sets out account and case terms, and the B2B wholesale collection lists the lines held for institutional buyers. The CliniEco dental range gathers the impression and isolation consumables, and a practice that wants the guard and impression lines together can start from the moldable night guard two-pack, the dental dam sheets or the biological indicator five-pack trial for practices that also run their own sterilizer.
Sources
- FDA device classification database, mouthguard codes
- FDA device classification database, prescription mouthguard
- openFDA device classification API
- 21 CFR 872.6390, dental floss
- 21 CFR 872.6010, abrasive device and accessories
- 21 CFR 872.5570, intraoral devices for snoring
- Medical Devices Regulations, SOR/98-282
- Medical Devices Regulations, section index
- Health Canada, medical devices
- Health Canada, drug and health product portal
- Medical Devices Active Licence Listing
- Royal College of Dental Surgeons of Ontario
- Canadian Dental Association
- American Dental Association
- ADA, science and research institute
- ISO 20795-1:2013, denture base polymers
- ISO 13485:2016, medical devices quality management
- ISO 15189:2022, medical laboratories
- CCOHS, OSH answers index
- Public Health Ontario, infection prevention and control
Print-ready companion: the free sterilization log sheet is built around the recordkeeping sections of the RCDSO IPAC Self Audit Review Form, and it prints from the browser with no account and no email.
An appliance that goes back in a patient’s mouth changes the reprocessing route. The sterilization log generator prints a dated cycle sheet for the loads that carried it.
Not sure how this applies to your own setup? Ask a compliance specialist — you’ll get a written answer specific to your equipment and province, with the regulation or standard it is based on cited.
Related reading
- Sports Mouthguards in Canada vs the US: Which Rules Apply?
- Dental Floss in Canada vs the US: Which Class Applies?
- Bite Registration Materials in Canada vs the US: Which Route Applies?
CliniEco Medical supplies eye care, laboratory and clinic consumables of the kind described in this article. MDEL #35334. This article is written for dental, laboratory and procurement professionals and is not dental, medical or regulatory advice; the classification of a specific appliance and the claims made for it belong to the manufacturer, the prescriber and the requirements that apply in the destination market.
Frequently Asked Questions
What class is a night guard in the United States?
It is unclassified. A bruxism night guard falls under one of the mouthguard product codes, such as OBR for an over-the-counter guard or MQC for a prescription guard, and none of those codes carries a regulation number.
What class is a night guard in Canada?
Class I under Schedule 1, Rule 2(2), because it is a device placed in the oral cavity as far as the pharynx. It becomes Class II under Rule 3(a) if it is a denture material or an orthodontic appliance, or an accessory of either.
Does the 30-day rule make a night guard Class III?
No, for a removable guard. Rule 2(3) reaches a device intended to remain in the body for at least 30 consecutive days, and a guard designed to be removed for meals and cleaning is not intended to remain in the body in that sense.
Is an over-the-counter guard a different class from a custom guard?
No. Both are classified by the same route on both sides of the border. The difference is who takes the impression and who carries the fit, not the class.
What makes a guard Class II in Canada?
Rule 3(a), which places all denture materials and orthodontic appliances, and their accessories, in Class II. If the appliance is characterised that way, the class moves even if the appliance is also a plain oral protector.
What should a practice hold for a custom night guard?
The intended-use statement, the product form, the material specification, the prescription record, and the fit and remake history, because those records are what support the class and the fit.
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