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Dr. Khalid AletaibiConservative Dentistry · Dubai

FUNCTIONAL DENTISTRY

Night guards, the appliance that protects what you already have.

Bruxism, grinding or clenching the teeth, usually during sleep, generates forces many times greater than normal chewing. Over months and years, those forces flatten biting surfaces, crack enamel, fracture restorations, and strain the jaw muscles. A well-fitted occlusal splint does not cure bruxism, but it absorbs the damage that would otherwise fall on the teeth. It is one of the simplest and most effective protective interventions in dentistry.

QUICK ANSWER

A night guard, more precisely, an occlusal stabilisation splint, is a custom-fitted appliance worn during sleep to distribute grinding and clenching forces across a smooth, even surface rather than concentrating them on individual teeth. The international consensus defines bruxism as a repetitive jaw-muscle activity characterised by grinding or clenching, and distinguishes between sleep and awake forms because their causes and management differ [^1]. Systematic reviews confirm that occlusal splints reduce tooth wear, muscle pain, and restoration fracture in bruxism patients, though they manage the damage rather than eliminating the habit itself [^3].

What bruxism actually is, and why it matters more than most patients realise

Bruxism is not simply a bad habit. The international consensus led by Lobbezoo and colleagues defined it as a repetitive jaw-muscle activity that can manifest as grinding, clenching, or bracing of the mandible, and drew a clear distinction between sleep bruxism and awake bruxism because they have different causes, risk factors, and clinical consequences [1]. Sleep bruxism is now understood as a centrally mediated motor behaviour linked to micro-arousals during sleep, not, as was once assumed, a response to an imperfect bite. This matters clinically because adjusting the occlusion does not stop sleep bruxism; protection is the primary management strategy.

The consequences of untreated bruxism are cumulative rather than sudden. Chemelo and colleagues' systematic review and meta-analysis confirmed a significant association between psychological stress and bruxism, establishing stress as a modifiable risk factor [5]. Kuang and colleagues found that sleep bruxism is associated with other sleep-related disorders including obstructive sleep apnoea, suggesting that in some patients the grinding is a symptom of a broader sleep quality problem [6]. These associations mean that a night guard, while essential for tooth protection, is rarely the complete management, understanding what is driving the bruxism is equally important.

What the evidence says about splints, and which type works

The most comprehensive evidence review on oral splints for bruxism is the Health Technology Assessment by Riley and colleagues, which systematically evaluated the clinical effectiveness and cost-effectiveness of different splint types [3]. The review confirmed that stabilisation splints, flat-plane, full-coverage, hard acrylic appliances adjusted to provide even bilateral contact, are the best-supported design for managing sleep bruxism. They distribute occlusal forces across a broad, even surface, reduce peak loading on individual teeth, and provide a sacrificial layer that wears instead of the enamel.

Ainoosah and colleagues' systematic review compared the different splint designs available and found that while several designs can reduce bruxism-related symptoms, the full-coverage stabilisation splint remains the most predictable choice [4]. Partial-coverage appliances, soft splints, and prefabricated over-the-counter guards have less evidence behind them and, in some cases, can alter the bite or increase muscle activity rather than reducing it. This is why I use laboratory-fabricated, hard acrylic stabilisation splints adjusted precisely to the patient's bite, the evidence supports this design, and the clinical predictability justifies the additional cost over a pharmacy guard.

How a night guard is made and fitted, and what else the management includes

A properly made occlusal splint begins with accurate impressions or digital scans of both arches and a bite registration. The laboratory fabricates the splint in hard acrylic, and I then adjust it chairside to ensure that when the patient bites down, the forces are distributed evenly across both sides with no premature contacts, a process that typically takes one fitting appointment with fine adjustments at a short follow-up. The splint is worn nightly, cleaned daily, and checked at regular recall appointments for wear, fit, and any changes in the bite.

But the appliance is only one part of the management. Minakuchi and colleagues' systematic review of sleep bruxism management in adults confirmed that effective care usually combines the splint with investigation and modification of contributing factors [2]. For patients whose bruxism is stress-related, stress management strategies and, where appropriate, referral to a psychologist or sleep specialist may be indicated. For patients whose grinding is associated with sleep-disordered breathing, a sleep study and collaboration with a sleep physician may be more important than the guard itself. I always assess the whole picture, the teeth, the muscles, the sleep history, and the patient's daily stress, before deciding on the management plan.

A night guard that is worn consistently, cleaned properly, and checked regularly at recall appointments is one of the highest-value investments in preventive dentistry. It does not stop grinding, but it ensures that the grinding damages a replaceable piece of acrylic rather than irreplaceable tooth enamel. For patients with significant bruxism, it is the single most important thing they can do to keep their dentistry small for the next decade.

COMMON QUESTIONS

What patients ask most.

How do I know if I grind my teeth at night?
Most sleep bruxism is unconscious, patients are unaware of it unless a partner hears the grinding or a dentist notices the signs. Common indicators include flattened or chipped biting surfaces, jaw stiffness or soreness on waking, headaches concentrated in the temples, and a history of cracked or broken restorations. I look for these signs at every examination and discuss them with you if they are present.
Can a pharmacy night guard work instead?
Over-the-counter boil-and-bite guards offer some basic cushioning, but they are soft, poorly fitting, and not adjusted to your bite. Evidence suggests that soft guards can actually increase clenching activity in some patients. A laboratory-made hard acrylic stabilisation splint, adjusted to provide even bilateral contact, is the evidence-based standard. It lasts longer, fits better, protects more effectively, and does not risk making the problem worse.
Will a night guard stop my grinding?
No. A night guard does not eliminate bruxism, it redirects the damage. You will still grind or clench, but the forces will be absorbed by the splint rather than by your teeth and restorations. Reducing the bruxism itself requires addressing the underlying contributing factors: stress, sleep quality, airway issues, medications, or caffeine and alcohol intake. The guard buys time and protects the teeth while those factors are investigated and managed.
How long does a night guard last?
A well-made hard acrylic splint typically lasts three to five years with nightly use, depending on how heavy the grinding is. Heavy bruxists may wear through the acrylic faster and need replacement sooner. This is actually a positive sign, the acrylic is doing its job by wearing down instead of the teeth. I check the splint at every recall appointment for wear patterns, fit, and any signs that it needs adjustment or replacement.
Is stress really a cause of grinding?
The evidence supports a significant association. Periods of high stress, anxiety, and poor sleep quality are consistently linked to increased bruxism activity. This does not mean that relaxation alone will cure grinding, the relationship is complex and other factors are usually involved, but managing stress is a meaningful part of the overall management plan for most bruxism patients.
Do I need to wear the guard every night?
Yes. Bruxism is not predictable, grinding intensity varies from night to night and often increases during stressful periods without the patient being aware. Wearing the guard consistently ensures protection on the nights when the grinding is heaviest, which are often the nights you would least expect it. The guard should become as routine as brushing your teeth before bed.

Signs of grinding or clenching?

If you wake with a sore jaw, your teeth are visibly flattened, or your restorations keep breaking, let's assess whether a night guard can protect what remains, and investigate what is driving the habit.

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