They look similar - all three are custom-fitted oral appliances, often worn at night. But they serve different purposes, are designed differently, and are prescribed for different reasons. Using the wrong one can be ineffective or, in some cases, make the problem worse.
What a night guard is
A night guard (also called an occlusal guard or bite guard) is designed to protect teeth from the forces of grinding and clenching during sleep. It creates a barrier between the upper and lower teeth so that the grinding wears down the guard rather than the tooth enamel.
Night guards are typically prescribed for patients with bruxism - habitual grinding or clenching, often during sleep. The goal is damage prevention. The guard does not stop you from grinding. It protects the teeth, restorations, and jaw joints from the consequences.
Custom-fitted night guards are made from a scan or impression so material, coverage, contacts, and fit can be planned and reviewed. Over-the-counter devices vary in design and fit and are not individually adjusted. At Ivy Dental, a custom night guard starts from $650.
Indicative pricing. Your quote may differ based on clinical assessment.
What a splint is
"Occlusal splint" is an umbrella term. Some designs aim to stabilise contacts or protect teeth; selected repositioning appliances alter the jaw relationship for a defined clinical reason. These are distinct from a mandibular advancement splint used in dental sleep medicine. An examination is needed because jaw pain and TMD symptoms have multiple causes.
Depending on the diagnosis and appliance design, adjustments may aim to control contacts, protect teeth, or support a symptom-management plan. A splint does not guarantee that pain, clicking, headaches, or grinding will resolve.
Splints are typically prescribed after a clinical assessment of the jaw, muscles, and bite. They may need periodic adjustment as symptoms change.
What a retainer is
A retainer is an appliance designed to hold teeth in their corrected position after orthodontic treatment (braces or clear aligners). It does not protect against grinding forces or manage jaw problems. Its only job is to prevent teeth from shifting back toward their original positions.
Retainers come in removable (clear or wire-based) and fixed (bonded wire behind the front teeth) forms. They are worn long-term, often for years after orthodontic treatment is completed.
Why using the wrong appliance can be a problem
The three appliances are sometimes confused because they can look alike - a piece of clear or hard plastic that fits over the teeth. But the design, material, thickness, and fit are all different because the clinical objectives are different.
A retainer worn by someone who grinds will wear through quickly and will not protect the teeth adequately. A generic night guard worn by someone with TMD may hold the jaw in a position that worsens their symptoms. A splint prescribed without proper diagnosis may alter the bite unnecessarily.
This is why assessment matters before any appliance is made. Matching the design to the diagnosis reduces avoidable risk, but outcomes still vary and the fit may need review or adjustment.
Book a bruxism or appliance assessment at Ivy Dental
How Ivy decides what you need
We start with an assessment of your symptoms, your bite, your jaw joints, and your teeth. If you are grinding, we look at the pattern and severity of wear. If you have jaw pain or clicking, we assess the TMJ and surrounding muscles. If you have completed orthodontic treatment, your orthodontist or dentist will have prescribed the appropriate retainer.
Based on the assessment, we recommend the appliance that matches the problem. In some cases, a patient may need both a splint for jaw management and a retainer for orthodontic stability, but these are separate appliances with separate functions.
If you have recently completed aligner treatment and are unsure about retainer needs, see our retainer replacement guide for detailed information on retainer types and costs.
How to care for your appliance
Whichever appliance you use, basic care extends its life. Rinse it after each use. Brush gently with a soft toothbrush and clear liquid soap. Avoid hot water, which can warp thermoplastic materials. Store it in its case when not in use. Bring it to your dental appointments so your dentist can check the fit and condition.
A well-maintained appliance can last several years. Neglected appliances wear out faster, fit poorly, and may stop doing their job effectively. If your appliance cracks, warps, or no longer fits snugly, contact us for a replacement rather than continuing to use a compromised device.
We see patients for appliance assessments at our Everton Park and Nundah clinics in Brisbane, 7 days a week.
Next step
If you are grinding, clenching, experiencing jaw pain, or are unsure which appliance you need, book an assessment. We will diagnose the issue first and recommend the appropriate appliance second.
Book an appliance assessment at Ivy Dental | Call (07) 3266 7120
For more on grinding and clenching, see our bruxism page. For retainer maintenance after orthodontic treatment, see retainer care.
