Obstructive sleep apnoea is far more than a snoring problem. It is a condition where the upper airway repeatedly collapses during sleep, causing breathing to pause, sometimes dozens or hundreds of times a night. Each pause triggers a brief arousal from sleep as the brain responds to falling oxygen levels. Most people are completely unaware this is happening.
The cumulative effect of this cycle, night after night, has consequences that extend well beyond feeling tired. Untreated sleep apnoea is associated with a range of serious health conditions, several of which carry significant long-term risk. Our sleep disorder assessment and treatment service at Simply Dental Chatswood is available for patients who suspect they may be affected or have already received a diagnosis.
What Is Obstructive Sleep Apnoea?
Obstructive sleep apnoea (OSA) occurs when the soft tissue at the back of the throat, including the tongue, soft palate, and uvula, relaxes during sleep and partially or fully blocks the airway. When the blockage is partial, the result is snoring. When the blockage is complete, breathing stops entirely until the brain signals the muscles to reopen the airway.
These events are measured by the Apnoea-Hypopnoea Index (AHI), which counts the number of breathing disruptions per hour of sleep. Mild OSA is defined as 5 to 14 events per hour, moderate as 15 to 29, and severe as 30 or more. The condition ranges from mild to severe, and the signs and causes of sleep apnoea vary considerably between patients depending on anatomy, lifestyle, and underlying health factors.
The Health Risks of Untreated Sleep Apnoea
The dangers of untreated OSA stem primarily from two mechanisms: chronic intermittent hypoxia (repeated drops in blood oxygen), and sleep fragmentation (the inability to progress through normal sleep stages). Both have wide-ranging physiological consequences.
Cardiovascular Disease
Each time breathing stops, blood oxygen drops and the brain triggers a stress response that raises heart rate and blood pressure. In a person with moderate to severe OSA, this stress response can occur hundreds of times per night. Over time, this chronic activation of the cardiovascular stress response contributes to sustained high blood pressure, increased risk of arrhythmia, and a significantly elevated risk of heart attack and stroke.
Research consistently identifies untreated OSA as an independent risk factor for cardiovascular disease, meaning the risk exists regardless of other factors such as weight or lifestyle. Patients with known heart conditions who are also found to have OSA are particularly strongly advised to pursue treatment without delay.
Type 2 Diabetes
Sleep apnoea and type 2 diabetes have a bidirectional relationship. OSA disrupts normal glucose metabolism and reduces insulin sensitivity, contributing to the development and worsening of type 2 diabetes. Conversely, the nerve damage associated with advanced diabetes can affect the muscles of the upper airway, increasing susceptibility to OSA.
For patients already managing diabetes, untreated sleep apnoea makes glucose control considerably more difficult, as the physiological stress responses triggered by apnoea events interfere directly with blood sugar regulation.
High Blood Pressure
Hypertension is one of the most consistent findings in patients with moderate to severe OSA. The repeated oxygen drops and sympathetic nervous system activation during apnoea events cause blood pressure to spike repeatedly throughout the night. Over time, these nocturnal spikes translate into sustained daytime hypertension that does not respond as expected to blood pressure medication.
This is clinically significant because resistant hypertension, blood pressure that remains elevated despite multiple medications, is frequently found to have untreated OSA as a contributing cause. Treating the OSA often produces meaningful improvements in blood pressure control.
Cognitive Impairment and Mental Health
The brain requires uninterrupted sleep cycles to consolidate memory, process information, and regulate mood. Repeated sleep fragmentation from OSA prevents the deep and REM sleep stages where these processes occur. The result is impaired concentration, reduced working memory, slower reaction times, and difficulty with complex tasks.
Chronic sleep deprivation from OSA is also associated with elevated rates of depression and anxiety. Some research has linked long-term untreated OSA to an increased risk of dementia, though this relationship is still being investigated. The cognitive effects of OSA are often misattributed to stress, ageing, or mental health conditions, which delays the correct diagnosis.
Daytime Fatigue and Accident Risk
Excessive daytime sleepiness is one of the most immediately disabling symptoms of OSA and one of the most dangerous. Patients with untreated sleep apnoea are significantly more likely to fall asleep at the wheel or during other tasks requiring sustained attention. This represents a direct safety risk, both to the individual and to others.
The fatigue also compounds the health risks of OSA in indirect ways. Persistent tiredness reduces motivation for physical activity, disrupts dietary habits, and makes it harder to maintain the lifestyle changes that reduce OSA severity.
Oral Health Consequences
Mouth breathing during sleep, which is common in OSA patients, significantly reduces saliva production and causes dry mouth. Saliva is the mouth’s primary defence mechanism against bacterial accumulation and acid attack on enamel. Chronic dry mouth from OSA increases the risk of tooth decay and gum disease, and patients often require more frequent dental care as a result. Where decay has already developed, a tooth-coloured filling can restore the affected tooth, but addressing the underlying dry mouth cause is equally important.
Bruxism, or teeth grinding during sleep, is also more common in people with OSA. The jaw clenching that occurs as the airway becomes obstructed places significant stress on the teeth, contributing to enamel wear, cracked teeth, and jaw pain.
Treatment Options for Sleep Apnoea
Treatment for OSA is matched to the severity of the condition and the patient’s specific anatomy and preferences.
Continuous Positive Airway Pressure (CPAP)
CPAP is the most established treatment for moderate to severe OSA. A machine delivers a continuous stream of pressurised air through a mask worn during sleep, preventing the airway from collapsing. It is highly effective when tolerated, but compliance is a significant challenge. Many patients find the mask uncomfortable, claustrophobic, or disruptive to sleep, and abandon the treatment.
For patients who struggle with CPAP compliance, alternatives including positional therapy, weight management, and oral appliance therapy are increasingly being used either as primary treatments or in combination with CPAP.
Mandibular Advancement Devices
Mandibular advancement devices (MADs) are custom-fitted oral appliances provided through a dentist. They work by holding the lower jaw in a slightly forward position during sleep, which prevents the tongue and soft tissue from collapsing into the airway. They are the primary dental treatment for mild to moderate OSA and for patients who cannot tolerate CPAP therapy. Our dental sleep disorder clinic in Chatswood can assess whether a mandibular advancement device is appropriate for your situation and fabricate a device fitted precisely to your teeth.
MADs also address bruxism, which frequently co-occurs with OSA, by providing a protective barrier between the teeth during sleep. This dual benefit makes them particularly appropriate for patients presenting with both conditions.
Lifestyle Modifications
For mild OSA, or as an adjunct to device-based treatment, lifestyle changes can meaningfully reduce the frequency and severity of apnoea events. Weight loss is the most consistently effective lifestyle intervention, particularly for patients where excess tissue around the neck is contributing to airway narrowing.
Avoiding alcohol in the hours before sleep reduces the relaxation of pharyngeal muscles that worsens obstruction. Positional therapy, sleeping on the side rather than the back, prevents the tongue from falling backward into the airway in patients whose apnoea is predominantly positional. Smoking cessation reduces upper airway inflammation that contributes to obstruction.
When to Seek Assessment
OSA is significantly underdiagnosed, partly because the most obvious symptom, snoring, is normalised, and partly because sufferers are asleep when the breathing disruptions occur. Partners are often the first to notice the characteristic pattern of loud snoring, silence, then a gasp or snort as breathing resumes.
According to the Australian Dental Association, dental professionals play an important role in identifying patients at risk of sleep-disordered breathing and coordinating appropriate referral and treatment. If you or a partner have noticed any of the signs associated with OSA, early assessment is the right step.
An assessment at our Chatswood sleep disorder centre begins with a clinical review of your symptoms and airway anatomy. Where a formal sleep study is needed to confirm severity, we can coordinate referral to an appropriate sleep physician and then provide the dental component of treatment alongside that specialist care.
Welcoming Patients From Across the North Shore
We see patients for sleep disorder assessments from across the surrounding area. If you are based in Balmain, Castle Cove, or Willoughby, our Chatswood practice is straightforward to reach for a consultation.
Concerned About Sleep Apnoea?
If you are waking unrefreshed, experiencing daytime fatigue you cannot account for, or have been told you snore heavily or stop breathing during sleep, these are all reasons to seek an assessment. At Simply Dental Chatswood, our team will assess your airway, discuss your symptoms, and recommend the most appropriate path forward.
Book your sleep disorder assessment and take the first step toward safer, more restorative sleep.
