Updated September 6, 2026
Yes—a night guard can be made to fit over your lower teeth. Often called a lower night guard, bottom night guard or mandibular night guard, it is a custom dental appliance designed to fit the lower dental arch while creating a protective barrier between the upper and lower teeth.
Upper night guards may be more familiar, but the upper arch is not the only place a protective occlusal appliance can be worn. For some people, a lower guard feels more natural or works better with their existing dental situation.
What is a lower night guard?
A lower night guard is an intraoral appliance made to fit over the mandibular, or lower, dental arch.
When worn, the opposing upper teeth contact the surface of the appliance instead of grinding directly against the lower teeth.
The National Institute of Dental and Craniofacial Research (NIDCR) describes mouth guards used for bruxism as appliances that separate the teeth to help prevent dental damage from grinding and clenching.
That distinction is important: a conventional lower night guard is primarily a protective appliance. It should not be presented as a guaranteed way to stop sleep bruxism, eliminate clenching, correct the jaw or cure TMJ disorders.
How does a lower night guard work?
A properly designed lower guard fits securely around the lower teeth and provides a surface for the opposing teeth to contact.
Its main purpose is to reduce direct tooth-to-tooth contact during grinding and clenching.
This can help protect against mechanical consequences associated with more significant bruxism, including tooth wear and damage to teeth or restorations.
Research has not established that conventional occlusal splints reliably eliminate the underlying grinding behavior itself. Think of the guard first as protection—not as a cure for bruxism.
Does a lower night guard stay in place?
A properly fitted custom lower night guard should be designed to remain securely seated on the lower teeth during normal wear.
Retention depends on the shape of the teeth, the dental arch and the design and fit of the appliance—not on gravity.
A lower guard should not simply fall out because it is on the bottom teeth. At the same time, it should not create excessive pressure simply to stay in place.
If a lower guard repeatedly lifts off the teeth, feels unusually loose, creates strong pressure on individual teeth or suddenly fits differently, the appliance should be evaluated rather than forcing it into place.
Why would someone choose a lower night guard?
There is no single profile of the “ideal” lower-night-guard wearer. Some people simply prefer how a mandibular appliance feels.
Reasons someone may consider a lower guard include:
- they have worn a lower guard successfully in the past
- they find an upper appliance difficult to tolerate
- they prefer leaving the upper palate unobstructed
- upper dental work makes the lower arch a more practical option
- their dentist or appliance provider recommends the lower arch
- personal comfort makes them more likely to wear a lower appliance consistently
These are practical considerations, not universal rules. A lower night guard will feel wonderful to some people and more noticeable to others.
Can a lower night guard help if you have a sensitive gag reflex?
Possibly.
Some people who have difficulty tolerating an upper dental appliance prefer a lower night guard because it leaves the upper palate unobstructed.
But it would be too strong to say that lower guards universally prevent or reduce gagging. Gag sensitivity varies considerably from person to person, and appliance thickness, extension and overall fit can also affect tolerance.
If gag sensitivity has made an upper appliance difficult to wear, a lower design may be worth discussing.
What does a lower night guard feel like around your tongue?
Because the tongue rests close to the lower teeth, it will naturally encounter a lower night guard.
Some wearers adjust quickly and barely notice the appliance after a short adaptation period. Others are more aware of material along the lower arch and prefer an upper guard for that reason.
This is one of the clearest examples of why neither arch is automatically “more comfortable.” Comfort is individual.
Lower night guard vs. upper night guard
If you are still deciding between the two, the bigger comparison belongs in our Upper vs. Lower Night Guard guide .
For this page, the essential difference is straightforward: a lower guard fits the mandibular teeth, while an upper guard fits the maxillary teeth.
| Consideration | Lower Night Guard |
|---|---|
| Arch | Fits over the lower teeth |
| Primary role | Creates separation between opposing teeth to help protect against grinding contact |
| Palate | Leaves the upper palate unobstructed |
| Tongue | The tongue may initially notice material along the lower dental arch |
| Retention | Depends on tooth anatomy and appliance fit—not gravity |
| Best for | People whose dental situation or personal comfort makes the lower arch an appropriate choice |
Is a lower night guard better than an upper night guard?
Not universally.
We do not have good evidence showing that every person with bruxism gets a better outcome from one arch versus the other.
Likewise, we should not claim that upper and lower guards have been proven to produce identical results in every patient.
Both arches can support protective occlusal appliances. Which one is more appropriate depends on the individual mouth and the design of the appliance.
Can you wear a lower night guard with an overbite or underbite?
Potentially, yes—but an overbite or underbite does not create a simple rule that says you should automatically choose or avoid the lower arch.
Your bite affects how the upper teeth contact the appliance, so the design still needs to accommodate your actual dental anatomy.
Mild and common bite variations may not prevent someone from wearing a custom lower guard. More significant bite discrepancies, a recently changing bite, jaw locking or unexplained pain are reasons to seek individualized dental evaluation rather than choosing an arch from a general online rule.
Can you wear a lower night guard with dental implants?
A person with dental implants may be able to wear a lower night guard, but the answer depends on where the implants are located, the restorations attached to them and the overall condition of the mouth.
Implant-supported crowns and other restorations should not simply be treated as interchangeable with natural teeth when appliance design is being planned.
If you have multiple implants, an implant-supported bridge or complicated restorative work on the lower arch, an in-person dentist is the appropriate person to determine whether a lower appliance is suitable and how it should be designed.
Can you wear a lower night guard if you are missing teeth?
Sometimes.
A small missing-tooth area does not automatically prevent the use of a custom night guard, but the amount and location of remaining tooth structure influence how the appliance is retained.
Significant missing-tooth areas, mobile teeth, partial dentures or other complex restorative situations deserve individualized evaluation before ordering a conventional night guard.
What if you have a permanent lower retainer?
A bonded lower retainer does not necessarily make a lower night guard impossible, but the appliance must be designed so it does not catch on the wire or place inappropriate pressure on the teeth or retainer.
In some cases the upper arch may simply be easier to use. In others, a properly planned lower appliance can still be appropriate.
See our dedicated guide: Can I Wear a Night Guard If I Have a Permanent Retainer? .
What impression or dental scan is needed for a lower night guard?
Because the appliance fits the lower teeth, the laboratory needs an accurate record of the lower dental arch.
For a traditional custom workflow, that means a usable lower dental impression. If a qualifying digital dental scan is being used instead, the lower arch must be captured clearly enough for the laboratory to evaluate and fabricate the appliance.
Depending on the appliance and workflow, records of the opposing arch and bite relationship may also be important for evaluating how the upper teeth contact the finished guard.
How long should you wear a lower night guard?
If the appliance was made for sleep bruxism, it is generally worn during sleep according to the instructions provided with the appliance or by your dentist.
There is no special wear duration simply because the night guard is on the lower arch.
How long you continue using the appliance over months or years depends on why it was prescribed, your dental condition, whether grinding or clenching remains a concern and whether the guard continues to fit and function appropriately.
Can a lower night guard cause soreness or tooth pressure?
A new custom appliance can feel noticeable while you are adapting to it. Temporary awareness of the teeth, gums, tongue or saliva production can occur.
But there is an important difference between awareness and significant pressure or pain.
A lower night guard should not require persistent painful force to stay on the teeth.
Have the appliance evaluated if you develop:
- significant or worsening tooth pain
- one tooth that feels unusually pressured
- gum injury or sharp edges
- new or worsening jaw pain
- difficulty inserting or removing the appliance
- a persistent change in the way your teeth meet after removing the guard
NIDCR advises that intraoral appliances used for TMD-related concerns should not be designed to permanently change the bite and should be discontinued and evaluated if they cause pain.
Can a lower night guard change your bite?
A conventional protective night guard should not be intended to permanently reposition your teeth or change your bite.
A brief sense that the bite feels different immediately after removing a new appliance can be different from a persistent bite change.
If your teeth continue to meet differently, the appliance feels as though it is moving teeth, or you develop new pain, stop treating that as a normal adjustment issue and have the fit evaluated.
Can you wear an upper and lower night guard at the same time?
Ordinarily, you wear one conventional night guard, not one independently fabricated guard on each arch at the same time.
The opposing natural teeth contact the surface of the single appliance.
Wearing two separate night guards together should not be treated as a way to double the protection.
Specialized two-arch dental or sleep appliances are a different category and should be used only according to the clinician or manufacturer who designed them.
Does a lower night guard help TMJ pain?
A lower occlusal splint may be included in conservative care for some people with temporomandibular disorders, but the fact that an appliance sits on the lower teeth does not make it a universal TMJ treatment.
TMD includes many different joint and muscle conditions, and research on intraoral appliances for TMD pain is mixed.
If your primary concern is persistent jaw pain, locking, limited opening or an unexplained bite change, start with an appropriate clinical evaluation rather than choosing a lower guard simply because it is marketed as being better for the jaw.
Does a lower night guard treat snoring or sleep apnea?
No conventional lower bruxism guard should be treated as a substitute for a sleep-apnea appliance.
Mandibular advancement devices used for obstructive sleep apnea are specifically designed to reposition the lower jaw forward. A standard lower night guard used for tooth protection is a different appliance.
Loud habitual snoring, witnessed breathing pauses, gasping during sleep or significant daytime sleepiness warrant medical evaluation.
How do you clean a lower night guard?
A lower guard does not require a special cleaning routine simply because it sits on the mandibular arch.
For routine Sentinel night guard care:
- rinse the appliance with cool or lukewarm water after use
- gently brush the surfaces with a soft toothbrush and mild liquid soap
- rinse thoroughly
- allow excess moisture to dry before storage
- keep the storage case clean and ventilated
Avoid very hot or boiling water, aggressive abrasives and improvised harsh household chemicals.
For material-specific deeper-cleaning guidance, see our Complete Guide to Cleaning a Night Guard .
When might a lower night guard not be the best DIY choice?
Choosing lower versus upper is often a preference decision in an otherwise healthy, stable mouth.
Professional evaluation becomes more important if you have:
- mobile or significantly compromised lower teeth
- extensive lower implants, bridges or restorative work
- large missing-tooth areas
- active orthodontic treatment
- a complicated permanent-retainer situation
- significant bite instability
- jaw locking or restricted movement
- persistent unexplained tooth or jaw pain
- a history of night guards causing major fit or bite problems
Frequently asked questions about lower night guards
Can a mouth guard be made for the bottom teeth?
Yes. Custom night guards can be fabricated to fit the lower dental arch.
Are lower night guards less effective?
There is not good evidence establishing lower placement as inherently less effective. A properly designed lower appliance can create a protective barrier between opposing teeth. There is also not enough direct evidence to claim upper and lower placement produces identical outcomes for every wearer.
Will a lower night guard fall out while I sleep?
A properly fitted custom lower guard should be designed to remain securely seated. Retention depends on tooth anatomy and appliance fit rather than gravity.
Is a lower night guard better for gagging?
Some people with gag sensitivity prefer a lower appliance because it leaves the upper palate unobstructed. That does not mean a lower guard will prevent gagging for everyone.
Is a lower night guard better for your tongue?
Not necessarily. Because the tongue rests beside the lower teeth, some people notice a mandibular appliance more. Others adjust quickly and strongly prefer it.
Do lower night guards stop grinding?
Not reliably. Their clearest role is mechanical protection of the teeth. Current evidence does not establish that conventional occlusal splints reliably eliminate sleep bruxism itself.
Should I get an upper or lower night guard?
If you are still deciding between the two, see our Upper vs. Lower Night Guard: Which Should You Choose? .
The bottom line
A night guard does not have to be worn on the upper teeth.
A custom lower night guard is a legitimate protective option for people whose dental anatomy, existing dental work, previous experience or personal comfort makes the mandibular arch a good choice.
What matters most is not whether the appliance is labeled “upper” or “lower.” It is whether it fits securely, is appropriate for the teeth beneath it, provides the intended protection and can be worn comfortably and consistently.
Ready to compare Sentinel's custom options? Explore Custom Night Guards.
Sources
National Institute of Dental and Craniofacial Research (NIDCR): Bruxism . Last reviewed March 2025.
National Institute of Dental and Craniofacial Research (NIDCR): Temporomandibular Disorders.
Editor's note: Updated September 6, 2026. This article was substantially revised to focus specifically on lower-night-guard questions, separate lower-guard intent from the broader upper-vs.-lower comparison, update cleaning guidance, and remove unsupported claims that lower guards universally improve gag reflex, jaw pain, sleep quality or bruxism itself.
This article provides general educational information and is not a substitute for individualized dental or medical care.