Why You Should Be Sleeping With a Michigan Bite Splint

Most of the damage we treat at ADI did not happen suddenly. It accumulated — quietly, incrementally, and largely without awareness — while patients were asleep.

Teeth grinding and jaw clenching during sleep, collectively termed sleep bruxism, is one of the most underdiagnosed contributors to dental deterioration in adults. Sleep bruxism affects around 8% of adults and is characterised by grinding and clenching of teeth during sleep. Its consequences can include pain in the masticatory muscles and neck, headache, decreased pain thresholds, limitation of jaw range of motion, and overall impairment of oral health. That figure may underrepresent the true extent, because the condition is often only identified once visible damage has already occurred.

For many patients, the first indication is not the grinding itself — they are unaware of it — but a cluster of symptoms that appear unrelated until examined together.

Recognising the pattern

If you grind your teeth consistently, you may develop symptoms including headaches or facial pain, especially in the morning. To that list, clinicians would add jaw muscle soreness on waking, earache without infection, increased tooth sensitivity, and a sensation of tightness or fatigue in the face and temples that accumulates over days of poor-quality sleep.

The physical discomfort of bruxism can feed back into stress and anxiety, creating a perpetual loop. Difficulty sleeping because of the discomfort can lead to irritability, difficulty focusing, and fatigue — which in turn becomes another source of stress, lowering tolerance for discomfort and making the individual more emotionally reactive.

The stress-bruxism relationship is bidirectional. Oral health specialists often identify excessive stress and certain personality types as drivers of bruxism, with the condition frequently affecting people experiencing anger, pain, or frustration. For many of our patients in Hillcrest — professionals, parents, executives managing significant demands — this is a pattern that resonates precisely because their lives are full, and their nights are when that accumulated pressure is released, involuntarily, through the jaw.

What is actually happening to your teeth

The forces generated during sleep bruxism are substantially greater than those produced during normal function. Unlike the controlled, purposeful forces of eating, bruxism applies sustained, lateral pressure across enamel surfaces that were not designed for it. Over time, the results are cumulative and irreversible.

Tooth wear can progress 80 times faster in patients with untreated bruxism. Enamel — the hardest tissue in the human body, but entirely incapable of regenerating once lost — thins progressively from the biting surfaces. Teeth begin to appear shorter, edges become flat or chipped, and sensitivity develops as the underlying dentine is exposed. Existing restorations — whether fillings, crowns, or porcelain veneers — face the same attrition. Bruxism becomes clinically relevant when it leads to destructive tooth wear, failure of dental restorations, and failure of implants.

For patients who have invested in smile design, aesthetic rehabilitation, or implant treatment, unmanaged bruxism is the single most preventable threat to the longevity of that investment.

The Michigan bite splint

The Michigan bite splint is a custom-fabricated hard acrylic appliance, precision-fitted to cover the upper arch, and worn during sleep. It is the most clinically established appliance for managing both bruxism and temporomandibular disorders, and it has been used in this role for decades. For the management of bruxism and pain-related temporomandibular disorders, stabilisation splints — also known as Michigan-type splints — are the clinical standard.

The splint works through several mechanisms simultaneously.

First, it interposes a hard acrylic surface between the upper and lower teeth, preventing direct tooth-to-tooth contact during grinding. The acrylic absorbs the forces that would otherwise be transmitted directly through enamel and restorations. Michigan splints provide a protective barrier that shields teeth from the effects of grinding and clenching, reducing wear on both natural teeth and dental restorations.

Second, it evenly redistributes bite pressure, allowing the jaw to relax, relieving tension headaches, and preventing further wear or fracture — particularly in teeth with large fillings or existing restorations.

Third, the splint positions the jaw in a therapeutically stable relationship to the skull base. By stabilising the jaw's position during sleep, it may help alleviate the muscle tension and strain that accompany bruxism, potentially resulting in decreased jaw pain and associated headaches.

The distinction between a Michigan splint and an over-the-counter night guard is significant and worth understanding. A Michigan splint is precision-fabricated from hard acrylic to exact occlusal specifications. Every tooth in the upper arch has an even, calibrated contact with the splint's flat surface. This is not a generic product — it requires clinical measurement, bite registration, and careful adjustment at fitting to ensure the occlusion is precisely balanced. A poorly designed or ill-fitting appliance can, in some cases, worsen jaw positioning rather than improve it. The fabrication process at ADI incorporates intraoral scanning to ensure accuracy and fit.

The patient experience

Most patients adjust to wearing a Michigan splint within one to two weeks. The initial period of adaptation — managing the sensation of a foreign object in the mouth during sleep — is temporary. In clinical trials comparing different occlusal appliances, most patients preferred the Michigan splint due to its greater wearing comfort.

The clinical benefits, once adaptation is established, are typically noticeable within the first month. Patients commonly report a reduction in the frequency and intensity of morning headaches, decreased jaw soreness on waking, and a generalised improvement in sleep quality. The splint also functions as a monitoring tool: at review appointments, wear patterns on the acrylic surface provide clinical information about the nature and severity of grinding activity that would otherwise be invisible.

When a splint is indicated

A Michigan bite splint is appropriate for patients who:

• Wake regularly with jaw soreness, facial pain, or headaches
• Have been told by a partner that they grind their teeth during sleep
• Present with flattened, chipped, or visibly shortened teeth
• Have experienced repeated failure or fracture of fillings, crowns, or restorations
• Are planning, or have recently completed, significant restorative or aesthetic dental work
• Have been diagnosed with temporomandibular dysfunction

It is equally relevant for patients who exhibit none of these symptoms but show early clinical signs of enamel wear during routine examination. In that context, the splint is preventive rather than reactive — and far less costly than the restorative work that would otherwise become necessary.

A note on managing the underlying cause

A Michigan splint manages the consequences of bruxism and protects the dentition effectively. It does not, on its own, address the neurological and psychological drivers of the behaviour. Where stress, anxiety, or sleep disorders are identified as contributing factors, a multidisciplinary approach — incorporating appropriate psychological support, sleep hygiene, and in some cases physiotherapy for the masticatory musculature — yields better long-term outcomes than an appliance alone.

This is consistent with how we think about care at ADI: a splint is a precise, well-evidenced clinical tool, not a complete solution. Understanding why a patient is grinding is as important as protecting the teeth from its effects.