What Is a Night Guard and Do You Actually Need One?
A night guard is a custom-fitted plastic appliance worn over your teeth during sleep to protect them from grinding and clenching. It does not stop the grinding itself, but it absorbs the force, prevents enamel damage, reduces jaw strain, and limits the risk of cracked teeth. You likely need one if you wake with jaw pain, headaches, worn-down teeth, or if a partner has noticed grinding sounds while you sleep.
Most people who grind their teeth at night have no idea they are doing it. The grinding happens during sleep, when the body cannot moderate the force the way it does during the day. Patients often arrive at our Rexburg office complaining about headaches, jaw pain, or a chipped tooth, with no clear sense of where any of it came from.
A night guard does not cure the cause of teeth grinding. It controls the damage so the underlying issue can be addressed without your teeth paying the price along the way.
What a Night Guard Actually Does
A night guard is a thin appliance, usually made of medical-grade acrylic or thermoplastic, that sits over either your upper or lower teeth while you sleep. Most adults wear a guard on the upper arch, though the lower arch works equally well for some patients.
The guard performs three functions:
- It creates a physical barrier between your upper and lower teeth so they cannot grind directly against each other
- It absorbs and distributes the force of clenching across a larger surface area
- It allows the jaw to settle into a more neutral position during sleep
The result is less enamel wear, fewer cracked teeth, less morning jaw pain, and reduced strain on the temporomandibular joint.
Who Actually Needs a Night Guard
Not everyone who grinds occasionally needs a night guard. Light, occasional grinding does not usually cause measurable damage. The patients who benefit most fall into one of these categories:
- People with confirmed bruxism, the medical term for chronic teeth grinding or clenching
- People with diagnosed TMD, also called temporomandibular joint disorder
- People with visible enamel wear or flattened tooth surfaces
- People who have already cracked or chipped a tooth from grinding
- People taking certain antidepressants or stimulants that increase nighttime grinding
- People who clench during the day, especially under stress
If you check any of those boxes, an evaluation is worth scheduling. Our recent post on how stress affects your teeth covers the connection between mental health, clenching, and dental wear in more detail.
Signs You Might Be Grinding Without Knowing It
Because grinding happens during sleep, the symptoms show up in daytime patterns. The most common signs include:
- Headaches that arrive shortly after waking
- Soreness in the jaw, temples, or sides of the face in the morning
- Teeth that feel sensitive without obvious cavities
- Flattened or shortened front teeth
- A clicking or popping jaw
- Earaches with no ear infection
- Indentations or scalloped edges on the sides of your tongue
- A sleep partner who has heard grinding sounds at night
The American Sleep Association estimates that around 10% of adults experience nighttime bruxism. Many never know they have it until a dentist spots the damage during a routine exam.
How Bruxism Damages Teeth Over Time
The force of clenching during sleep is significantly higher than during normal chewing. Some studies estimate sleep bruxism can produce bite forces of 250 pounds per square inch or more, sustained for hours at a time. That kind of force takes a toll.
Long-term effects of untreated grinding include:
- Worn enamel that exposes the softer dentin underneath
- Increased tooth sensitivity to hot, cold, and sweet
- Microfractures that grow into full cracks
- Receding gums from chronic pressure
- Loosening of teeth in advanced cases
- Damage to existing crowns, fillings, and veneers
Our blog on what causes cracked teeth goes deeper into the mechanical wear patterns we see in patients with chronic bruxism.
Custom Night Guards vs. Store-Bought Options
You can buy a night guard at almost any pharmacy for $20 to $40. They come in two general categories. Boil-and-bite guards soften in hot water so you can shape them against your teeth. Stock guards arrive pre-formed in standard sizes. Both serve a purpose, but neither is a substitute for a custom appliance.
Where Store-Bought Guards Fall Short
Pharmacy guards are typically bulky and made of soft material. The softness sounds comfortable, but it can actually encourage more grinding. Patients chew on the soft material the same way they would a piece of gum, which can worsen jaw muscle tension over time.
Stock guards also do not account for the unique shape of your bite. A poor fit shifts the position of your jaw, sometimes creating new problems while trying to solve old ones.
What Custom Night Guards Provide
A custom night guard is made from a digital scan or impression of your teeth. The material, thickness, and coverage are matched to your specific bite pattern, grinding severity, and jaw position.
The advantages include:
- Precise fit that stays in place all night
- Material thickness chosen for your level of grinding
- Even distribution of force across the bite
- Better breathing and sleep comfort compared to bulky pharmacy options
- Years of durability rather than months
- Integration with TMD treatment if needed
Most custom guards last 3 to 10 years with proper care. Pharmacy guards typically need replacement every few months.
How a Night Guard Fits Into TMD Treatment
For patients diagnosed with TMD, a night guard is often the first step in a broader treatment plan. The guard relieves the joint while other interventions, like physical therapy, stress management, or bite adjustment, address the root cause.
Our TMD service page explains the range of treatments we offer for jaw joint disorders. In most cases, a night guard is the most conservative and reversible option, which is why dentists tend to recommend it before more involved procedures.
What to Expect From the Process
If you decide to pursue a custom night guard, the process is straightforward.
- A consultation and exam to confirm bruxism or TMD and identify any existing damage
- A digital scan or traditional impression of your teeth
- Fabrication of the guard, usually completed within 1 to 2 weeks
- A fitting appointment to check the bite and make any adjustments
- Follow-up after a few weeks of wear to confirm comfort and effectiveness
Most patients adjust to wearing the guard within a few nights. Some report better sleep quality from the start, especially those with chronic jaw tension.
When to Consider an Evaluation
Persistent morning jaw pain, frequent headaches, and visible wear on your front teeth are not symptoms to push through. The longer grinding continues untreated, the more damage accumulates and the more expensive the eventual restoration becomes.
If any of the warning signs in this article sound familiar, request an appointment for an evaluation. We can confirm whether grinding is causing the damage, recommend a guard if appropriate, and address any underlying issues.
Frequently Asked Questions
How long does a custom night guard last?
A well-cared-for custom night guard lasts 3 to 10 years. Hard acrylic guards generally last longer than soft or dual-laminate guards. Heavy grinders may need replacement sooner.
Can I wear a night guard if I have braces or Invisalign?
Patients with traditional braces typically wait until treatment is complete before getting a night guard. Patients in Invisalign treatment usually do not need a separate guard, since the aligners provide some bite protection. Talk to your dentist about your specific situation.
Will a night guard stop me from grinding?
No. A night guard does not stop the grinding behavior. It protects your teeth from the damage caused by grinding. Addressing the underlying cause, whether that is stress, sleep apnea, or another factor, requires separate treatment.
How much does a custom night guard cost?
Custom night guards typically range from $300 to $800 depending on the type, material, and your geographic area. Some dental insurance plans cover part of the cost, especially when bruxism is diagnosed and documented. Your office can verify your specific benefits.
Can I clean my night guard in the dishwasher?
No. Heat warps the material and ruins the fit. Clean your night guard with cool water, mild soap, and a soft toothbrush. Soaking it in a denture cleaning solution once a week helps remove buildup.
What happens if I never get a night guard but keep grinding?
The long-term outcome depends on how severely you grind. Many patients eventually need crowns to rebuild worn-down teeth, root canals for cracked teeth, or extractions in severe cases. The earlier you intervene, the less restorative work you typically need later.
This article is for informational purposes only and does not constitute medical or dental advice. Consult a qualified dental professional at Eagle Rock Dental Care or another licensed provider for diagnosis and treatment recommendations specific to your situation.