TMJ and Teeth Grinding: Signs, Damage, and What to Do
Most Grinders Don't Know They're Grinding
Teeth grinding — known clinically as bruxism — is one of the most common drivers of TMJ disorder, and one of the most underdiagnosed. The reason is straightforward: most grinding happens at night, while you're asleep. You can't feel it happening, you can't stop it consciously, and unless someone sleeping nearby mentions it, you may have no idea it's occurring at all.
At Dr Gray Dentistry in Durban, Dr Gray regularly identifies bruxism in patients who came in for completely unrelated concerns — only to find worn teeth, jaw muscle tenderness, and joint strain that points clearly to years of undetected grinding.
What Is Bruxism?
Bruxism is the involuntary grinding, clenching, or gnashing of teeth. It falls into two categories:
Sleep bruxism — grinding that occurs during sleep, classified as a sleep-related movement disorder. This is the most common form and the most damaging, because it happens without any conscious awareness and can continue for hours.
Awake bruxism — clenching or pressing the teeth together during waking hours, usually in response to stress, concentration, or anxiety. People with awake bruxism often do it during demanding tasks — driving, working at a screen, or during difficult conversations — without realising their jaw is tightly held the entire time.
Many patients have both.
Signs You May Be Grinding Your Teeth
Because sleep bruxism is invisible to the person doing it, the signs tend to show up indirectly. Watch for:
Physical signs in your mouth
Teeth that look flattened, worn down, or shorter than they used to be
Chipped or cracked teeth with no obvious cause
Increased tooth sensitivity — especially to temperature
Indentations on the sides of your tongue (from pressing against clenched teeth)
Ridging along the inside of your cheeks
Pain and symptoms
Jaw soreness or stiffness that is worst in the morning
A dull, persistent headache — particularly at the temples — upon waking
Earache without any ear infection
Facial muscle fatigue or a feeling of heaviness in the jaw
Neck and shoulder tension that is present first thing in the morning
Reports from others
A partner mentioning grinding or clicking sounds during sleep
A dentist noting unusual tooth wear during a routine check-up
If several of these apply to you, bruxism is worth investigating — and addressing — before further damage occurs.
How Grinding Damages the TMJ
The jaw joint is designed to handle normal chewing forces — which are significant in themselves. But bruxism generates forces far beyond what the joint was built for. Studies have measured bruxism forces at several times the load of normal chewing, sustained repeatedly throughout the night.
Over time, this does real damage:
Joint inflammation — the repeated overloading of the TMJ creates chronic low-grade inflammation inside the joint capsule, leading to pain, stiffness, and reduced range of motion.
Disc displacement — the TMJ contains a small cartilage disc that cushions the joint. Sustained grinding forces can push this disc out of position, causing the clicking, popping, or locking sensations many TMJ patients experience.
Muscle fatigue and trigger points — the muscles responsible for jaw movement — the masseter, temporalis, and pterygoids — are put under enormous strain during grinding. Over time, they develop chronic tension and trigger points that refer pain to the temples, ears, and neck.
Tooth damage — beyond the joint, bruxism gradually destroys tooth structure. Enamel does not grow back. Once teeth are worn down, restoration becomes necessary — and extensive grinding damage can require significant dental work to correct.
What Triggers Bruxism?
Bruxism rarely has a single cause. The most common contributing factors include:
Stress and anxiety — the most well-established trigger. The jaw is where many people physically hold emotional tension, and during sleep the conscious control that might otherwise suppress this is absent.
Sleep disorders — there is a well-documented association between sleep bruxism and obstructive sleep apnoea. When the airway is disrupted during sleep, the body sometimes responds by moving the jaw — triggering a grinding episode.
Certain medications — some antidepressants, particularly SSRIs, are associated with increased bruxism as a side effect. If you started grinding around the time you began a new medication, mention this to both your doctor and Dr Gray.
Bite problems — when the upper and lower teeth don't meet properly, the jaw muscles compensate by searching for a comfortable position during sleep, which can manifest as grinding.
Caffeine and alcohol — both are associated with increased bruxism severity, particularly when consumed in the hours before sleep.
What Can Be Done About Bruxism and TMJ Grinding?
Bruxism cannot always be eliminated entirely — but its impact on the jaw joint and teeth can be dramatically reduced with the right approach.
Custom occlusal splint (nightguard) This is the cornerstone of bruxism management. A custom-fitted nightguard — fabricated from a precise scan of your teeth — creates a protective barrier that absorbs grinding forces and prevents the jaw from fully engaging during sleep. It protects both the teeth and the joint simultaneously. Over-the-counter guards are widely available but rarely fit accurately enough to be effective — and a poorly fitting guard can actually worsen jaw symptoms. A custom appliance from Dr Gray Dentistry is worth the difference.
Bite correction Where a bite imbalance is contributing to the grinding pattern, addressing it directly — through selective adjustment or restorative work — removes one of the key triggers.
Trigger point injections For patients with significant muscle involvement, Dr Gray may inject overactive trigger points to release chronic muscle tension and break the pain-grinding cycle.
Sleep apnoea assessment Given the strong link between grinding and sleep-disordered breathing, patients with significant bruxism may be referred for a sleep study to rule out or address underlying airway issues.
Stress management and lifestyle Reducing caffeine — particularly after midday — limiting evening alcohol, and actively managing stress levels all have a measurable effect on grinding severity. These aren't token suggestions; they make a real difference.
Don't Wait Until the Damage Is Done
Bruxism is one of those conditions where early intervention pays enormous dividends. A nightguard fitted now protects teeth and joint tissue that cannot be recovered once lost. Addressing the jaw muscle tension before it becomes entrenched is far easier than treating chronic TMJ disorder that has developed over years of unmanaged grinding.
Protect Your Jaw at Dr Gray Dentistry, Durban
If you suspect you may be grinding your teeth — or if you've been told you do — Dr Gray at Dr Gray Dentistry in Durban, South Africa can assess the impact on your jaw joint and teeth, and put a protection plan in place before the damage progresses.
Book your bruxism and TMJ assessment with Dr Gray Dentistry in Durban today.