A custom-made night guard usually lasts 3 to 10 years, depending on how hard you grind and what it’s made of, while soft store-bought guards often wear out in a few months to a year. Wear and tear on a night guard is normal and expected, since it’s taking the damage instead of your teeth, but cracks, holes, a loose fit or a bad smell mean it’s time to have your night guard checked or replaced.
Think of a night guard as a crash pad. Every night, it absorbs forces that would otherwise chip enamel, crack fillings and strain your jaw. Heavy grinders can chew through a soft guard surprisingly fast.
People sometimes ask whether they can just use a sports mouthguard at night. They’re designed for different jobs. A sport guard is thick and cushioned to absorb impact, while a night guard is thinner and shaped to let your jaw muscles relax.
Replacing a worn guard is a lot easier than repairing cracked teeth. When grinding has already broken teeth down, crowns and bridges may be needed to rebuild them, and a new guard protects that work. At Ardagh Family Dentistry, a best dental office pick for many local families, guards are checked at regular visits.
If you’re looking for a dentist in Barrie to assess grinding, here’s how to tell when your guard is done and how to make the next one last longer.
What is a night guard?
A night guard (also called an occlusal guard or splint) is a removable appliance worn over the upper or lower teeth during sleep. It protects teeth from grinding and clenching (bruxism) and can reduce strain on the jaw muscles and joints.
What causes teeth grinding?
Bruxism has more than one cause, and it’s often a mix.
- Stress and anxiety: The most common trigger for daytime clenching and nighttime grinding.
- Sleep-related breathing issues: Snoring and sleep apnea are linked with grinding in many people.
- Caffeine, alcohol and nicotine: All can increase grinding, especially close to bedtime.
- Some medications: Certain antidepressants are known to increase grinding in some people.
- Bite issues: Missing teeth or uneven contacts can play a role.
- Habit: Some people clench while concentrating, driving or working out.
A night guard protects your teeth while you work on the triggers you can change.
How long do different night guards last?
| Type | Material | Typical lifespan |
|---|---|---|
| Store-bought soft guard | Soft vinyl | A few months to about 1 year |
| Boil-and-bite guard | Thermoplastic | About 6 months to 2 years |
| Custom soft guard | Soft laminate | 1 to 3 years |
| Custom dual-laminate guard | Hard outside, soft inside | 2 to 5 years |
| Custom hard acrylic guard | Rigid acrylic | 5 to 10 years with good care |
These are rough ranges. A light clencher can get a decade from a hard guard. A heavy grinder might wear through it in a few years.
What shortens a night guard’s life?
- Heavy grinding. Some people grind so hard they leave grooves or holes in the material.
- Soft material. Soft guards can actually encourage some people to chew on them.
- Hot water. Warps the shape.
- Poor cleaning. Bacteria and plaque build up, causing odour and discolouration.
- Pets. Dogs love chewing night guards. Keep it in its case.
- Dental changes. New crowns, fillings or tooth movement can change how the guard fits.
8 signs your night guard needs replacing
- Cracks, splits or holes
- Deep grooves or thin spots worn through
- A loose fit that slips or falls out at night
- A fit that’s too tight or causes sore teeth or gums
- Persistent bad smell or taste after cleaning
- Discolouration or cloudiness that won’t clean off
- Jaw pain or headaches returning
- You’ve had dental work that changed your bite
Bring your guard to every checkup. Your dentist can check the fit, look for wear patterns that show how you grind, and adjust or polish it. Wear patterns can also hint at changes in your bite or grinding intensity.
Custom vs store-bought night guards
| Custom | Store-bought | |
|---|---|---|
| Fit | Made from impressions or a scan of your teeth | Generic or moulded at home |
| Comfort | Thin, precise, easier to sleep in | Often bulky |
| Durability | Years | Months |
| Bite balance | Adjusted so teeth contact evenly | Not adjusted; may change bite over time |
| Best for | Ongoing grinding, jaw pain, dental work protection | Short-term use while waiting for a custom guard |
What happens if you keep using a worn night guard?
- Thin spots let teeth grind through to each other
- A loose guard can shift your bite or irritate gums
- Bacteria in cracks can cause bad breath and gum irritation
- Jaw muscle pain and headaches can return
- Over time, you’re back to the damage the guard was meant to prevent
Signs you grind your teeth
Many people don’t know they grind until a dentist or partner points it out.
- Worn, flat or chipped tooth edges
- Tooth sensitivity without cavities
- Sore jaw or tight face muscles in the morning
- Dull headaches at the temples when you wake
- A partner hearing grinding at night
- Cracked fillings or teeth
- Scalloped tongue edges or ridges on the inside of the cheeks
How to make your night guard last longer
- Rinse it every morning in cool or lukewarm water.
- Brush it gently with a soft toothbrush and mild, unscented soap. Skip toothpaste; it’s abrasive.
- Soak it weekly in a non-alcohol cleaner or denture-type tablet if your dentist recommends one.
- Let it dry before storing to limit bacteria.
- Store it in a ventilated case, away from heat and pets.
- Never use hot or boiling water.
- Brush your teeth before putting it in, so plaque isn’t trapped against them all night.
- Bring it to checkups for a fit check and polish.
Do kids need night guards?
Grinding is common in young children, and many grow out of it as their adult teeth come in. Because their mouths are still growing, a fixed night guard often isn’t the first step for kids.
Still, persistent grinding in a child, especially with snoring, mouth breathing or restless sleep, deserves a dental check. Teens with adult teeth who grind heavily may benefit from a guard, which will need replacing more often as they grow.
Other ways to reduce grinding damage
- Cut back on caffeine after lunch and alcohol in the evening
- Build a wind-down routine before bed
- Practise “lips together, teeth apart” during the day
- Ask your doctor about sleep testing if you snore or feel tired despite enough sleep
- Gentle jaw stretches and warm compresses for sore muscles
Myths about night guards
“A night guard stops grinding.”
A guard protects your teeth from grinding. It doesn’t always stop the habit. Stress, sleep issues, caffeine, alcohol and some medications all influence bruxism.
“If it’s worn, it’s failing.”
Wear means it’s doing its job. The question is whether there’s enough material left to protect you.
“A sports mouthguard works just as well.”
Sports guards are bulky and can make the jaw work harder at night. A night guard is designed for sleep.
“Soft guards are always more comfortable.”
Some people find soft guards make them chew more. Hard or dual-laminate guards are often better for heavy grinders.
Real patient examples
A 38-year-old used a store-bought guard and chewed a hole through it in four months. She switched to a custom hard acrylic guard, which has lasted over five years with yearly polishing.
A 52-year-old had a new crown placed on a molar. His old guard no longer fit evenly and caused sore teeth. A new guard made after the crown solved it.
A 27-year-old’s guard started smelling bad despite rinsing. She’d been storing it wet in a closed case. Better cleaning and letting it dry fixed the issue.
How a custom night guard is made
- Exam. Teeth, wear patterns, jaw joints and muscles are assessed.
- Impressions or digital scan. Quick and comfortable.
- Bite record. To make sure your teeth meet evenly on the guard.
- Fabrication. Made in a lab from durable material.
- Fitting. The guard is tried in, adjusted and polished.
- Follow-up. A check after a few weeks, then at regular visits.
Night guards from a family dentist in Barrie
Ardagh Family Dentistry is a trusted family dentist in Barrie with a fully equipped, wheelchair-accessible facility serving families of all ages. You’ll find us in the Ardagh Bluffs area at Circle K Plaza, 225 Ferndale Dr. S., Unit 7, Barrie, ON L4N 6B9.
We welcome new patients and CDCP (Canadian Dental Care Plan) patients. Our services include preventive care, sealants, digital radiography, cleanings, sport guards, extractions, root canals, teeth whitening, dentures, crowns, bridges and night guards. For anxious patients, we offer dentistry with nitrous oxide (laughing gas).
Call +1 705-315-0219 or email info@ardagh.ca to have your night guard checked or to book a grinding assessment. Our team aims to respond quickly and fit you in at a convenient time.
Every assessment is done by dentists registered with the Royal College of Dental Surgeons of Ontario (RCDSO), so your guard is designed around a proper diagnosis of your teeth, bite and jaw.
Frequently asked questions
How often should a night guard be replaced?
Custom hard guards often last 5 to 10 years, while soft or store-bought guards may need replacing every few months to a year. Replace any guard that’s cracked, loose or worn thin.
Can a night guard be repaired?
Small rough spots can be smoothed and polished, and some fit issues can be adjusted. Cracks and holes usually mean a new guard is needed.
Is it normal for a night guard to change colour?
Some yellowing over time is normal. Heavy discolouration, odour or residue that won’t clean off suggests bacterial buildup and a need for better cleaning or replacement.
Should I wear my night guard on my top or bottom teeth?
Either can work. Your dentist chooses based on your bite, comfort and any dental work. Upper guards are more common.
Do I need a new night guard after getting a crown?
Often. A new crown can change the shape of a tooth enough that your old guard no longer fits evenly. Your dentist can check whether it can be adjusted.
Conclusion
Custom night guards usually last 3 to 10 years, while store-bought guards wear out much sooner.
Cracks, holes, a loose fit or returning jaw pain are the main signs it’s time to replace yours.
Gentle cleaning, safe storage and regular checkups help your guard protect your teeth for as long as possible.
