Occlusal Splint vs Nightguard: What Is the Difference and Which One Do You Need?

TL;DR

• Rinse your occlusal splint under cool water every time you remove it, and brush it gently with a soft toothbrush before reinserting.
• Never use hot water, toothpaste, bleach, or mouthwash containing alcohol on your splint, as these warp or degrade the acrylic material.
• A deeper clean with a diluted denture tablet solution is recommended once or twice a week to control bacteria and odour.
• Store your splint in a ventilated hard case when not in use, and bring it to every dental check-up so your dentist can inspect it.
• A well-maintained splint lasts significantly longer and is far more comfortable to wear each night.

You have just collected your new occlusal splint from the dental chair, the team has shown you how it fits, and you are heading home feeling relieved that you finally have something to protect your teeth. Then, somewhere between the car park and your front door, the question hits: how exactly am I supposed to clean this thing? It is one of the most common questions we hear at Swish Dental, and it is a genuinely important one.

This guide walks you through everything you need to know about how to clean a dental splint properly, from the two-minute daily routine to a deeper weekly soak, plus the products you should never go near. Whether your splint is brand new or has been sitting in a drawer for months, the steps below will help you keep it fresh, hygienic, and fitting well for years to come.

Why cleaning your occlusal splint matters

Your splint spends six to eight hours each night sitting in a warm, moist environment. That combination creates ideal conditions for bacteria, plaque, and calcium deposits to build up on the appliance surface. According to the Australian Dental Association, oral bacteria can roughly double in number every five hours under the right conditions, which is exactly why rinsing a splint immediately after removal is so important. Overnight bacterial accumulation does not just make the appliance smell unpleasant; left unchecked over time, it can contribute to bad breath, gum irritation, and, in more serious cases, oral infections.

The reassuring news is that a proper cleaning routine takes less than two minutes each morning. That small daily habit dramatically extends the life of your appliance and protects what is a meaningful investment in your dental health. If you are still learning about what occlusal splints do and who they are recommended for, the splint dental page on our website covers everything from jaw pain and TMJ to how the fitting process works.

What you will need before you start

You do not need a collection of specialist products. Most of what you need is already in your home, or is easily available from a pharmacy.

Safe supplies to have on hand:

• A dedicated soft-bristled toothbrush (separate from the one you use for your teeth)
• Fragrance-free, unscented liquid hand soap, or a non-abrasive denture cleaner
• Fragrance-free, alcohol-free denture cleaning tablets
• Cool or lukewarm water
• A ventilated hard storage case

What to avoid, and why it matters:

• Toothpaste: The abrasive micro-particles that make toothpaste effective on enamel will scratch the acrylic surface of your splint, creating tiny grooves where bacteria can hide and multiply.
• Hot or boiling water: Acrylic resin, the material most occlusal splints are made from, can begin to warp at temperatures above approximately 60 degrees Celsius, according to the National Institute of Dental and Craniofacial Research. Even a few seconds under a hot tap is enough to alter the custom fit.
• Bleach or harsh household disinfectants: These chemically degrade the acrylic and may leave residues that irritate oral tissues.
• Alcohol-based mouthwashes: Alcohol dries and eventually cracks acrylic over repeated exposure. Soaking or rinsing with these products shortens the life of your splint considerably.

That list might look daunting, but the core message is straightforward: keep things cool, gentle, and fragrance-free.

How to clean a dental splint: your daily step-by-step routine

This routine is designed to take no more than two minutes and should happen every morning, or immediately after you remove the splint.

1. Rinse immediately. As soon as the splint comes out, hold it under a gentle stream of cool running water to remove loose saliva and any debris before it has a chance to dry onto the surface.
2. Apply your cleaner. Place a small drop of fragrance-free liquid soap or non-abrasive denture cleaner onto your dedicated soft-bristled toothbrush.
3. Brush every surface. Use small, gentle circular strokes across the entire splint, paying particular attention to the inner ridges and any grooves that contact your teeth. Plaque tends to settle in these areas first.
4. Rinse thoroughly. Hold the splint under cool running water until every trace of soap is gone. Residual soap tastes unpleasant and can irritate the soft tissues in your mouth.
5. Inspect before storing. Take five seconds to look at the splint for cloudiness, cracks, rough patches, or discolouration. Catching small changes early means smaller problems to fix later.
6. Store correctly. Place the splint in its ventilated hard case, away from heat sources and out of reach of pets (who are surprisingly attracted to the scent of saliva on acrylic).

Best way to clean an occlusal splint for a deeper weekly clean

A daily brush keeps the surface clean, but a weekly soak addresses the bacteria and odour that build up in ways brushing alone cannot fully reach. Once or twice a week, drop a fragrance-free, alcohol-free denture cleaning tablet into a cup of cool water, place the splint in the solution, and soak for 10 to 15 minutes. Set a timer, because prolonged soaking beyond the manufacturer's instructions can degrade certain acrylic materials over time.

After the soak, give the splint a gentle brush with your dedicated toothbrush to dislodge any loosened deposits, then rinse thoroughly under cool running water before storing or reinserting it.

If calcium deposits are building up despite regular cleaning, a short white vinegar soak can help. Mix one part white vinegar with three parts cool water and soak the splint for no more than five minutes. Rinse very thoroughly afterwards. This approach should complement your denture tablet routine, not replace it, and is best kept to occasional use rather than a regular weekly habit.

Tips and tricks to keep your dental splint clean between cleans

Small habits make a real difference to how clean your splint stays day to day.

• Always give the splint a quick rinse under cool water before reinserting it, even if it has only been sitting in its case for a few hours. Dust and airborne particles can settle on the surface.
• Avoid eating or drinking anything other than plain water while the splint is in. Food particles and sugary or acidic drinks get trapped beneath the appliance and accelerate bacterial growth significantly.
• Rinse your mouth with water before inserting the splint at night. This reduces the volume of bacteria transferred onto the appliance surface from the outset.
• Replace your dedicated cleaning toothbrush every two to three months, or sooner if the bristles begin to splay. Splayed bristles clean far less effectively and can scratch the acrylic.
• Clean the storage case itself. Rinse it daily and wash it with soap and water once a week. A dirty case immediately recontaminates a freshly cleaned splint, undoing all your effort.

How often should you have your splint professionally cleaned?

Even with an excellent home care routine, mineral deposits and microscopic surface wear accumulate over time in ways a toothbrush simply cannot address. The Australian Dental Association recommends bringing custom-fitted oral appliances, including splints, to every routine dental visit for professional inspection and cleaning assessment.

At both Swish Dental locations in Everton Park and Mitchelton, our clinical team can professionally clean, polish, and inspect your splint as part of a regular dental check-up. We look for cracks, changes in fit, and surface wear that can be difficult to spot at home. Catching fit problems early prevents jaw discomfort and extends the life of the appliance considerably.

Bruxism, the teeth grinding that occlusal splints are most commonly prescribed for, affects an estimated 5 to 8 percent of adults, according to the Australian Institute of Health and Welfare. That makes splints one of the most frequently used appliances in general dental practice, and one that benefits greatly from regular professional review alongside good home care.

If your splint develops a persistent odour, visible discolouration that does not improve after a thorough cleaning routine, or any physical damage, please book an appointment sooner rather than waiting for your next scheduled visit.

Signs your splint may need replacing

A well-maintained splint can last for several years, but no appliance lasts forever. Contact Swish Dental if you notice any of the following:

• Visible cracks, chips, or fractures in the acrylic that cannot be polished smooth
• A noticeable change in fit: the splint feels loose, rocks, or no longer sits evenly across your teeth, which may indicate the appliance has warped or your bite has shifted
• Persistent cloudiness, staining, or odour that does not clear after a thorough cleaning routine, suggesting the surface has become too porous to be adequately disinfected

Continuing to wear a damaged or ill-fitting splint affects its protective function and can place uneven pressure on the jaw. If any of the above applies to you, call our team on 07 3354 3341 and we will assess whether a repair or replacement is needed.

Caring for your splint is caring for your overall oral health

The two-minute daily routine described in this guide is the single most important habit you can build. Rinse, brush gently with fragrance-free soap, rinse again, and store it in a clean ventilated case. Add a weekly denture tablet soak and bring the splint along to every check-up, and you will get the most out of your appliance for as long as possible.

If you have any questions about your splint dental care, or if you are concerned about fit, damage, or anything else, our friendly team at Swish Dental is always happy to help. You can reach either our Everton Park or Mitchelton practice by calling 07 3354 3341, or book online at any time through our website.