Collapsed Bite and TMJ Pain: Restoring Your Bite Step by Step

Your back teeth do more than chew. They act like pillars that hold your upper and lower jaws at the right height when you bite. When those pillars wear down or are lost, the bite can slowly “collapse.” For some people that causes no trouble at all. For others it comes with jaw pain, headaches and damage to the front teeth or gums.

Dr. Venelin Topouzov, the dentist at York Street Dental Centre, has a long-standing interest in this problem. With co-author Dr. Justin Lee, he has published two clinical articles in Oral Health, a Canadian dental journal, describing how he assesses and restores a collapsed bite. This article explains that work in plain language so patients know what the condition is and what treatment can involve.

What is a collapsed bite?

When you close your back teeth together, there is a set distance between your upper and lower jaw. Dentists call this the vertical dimension of occlusion, or VDO.

Some tooth wear with age is normal and usually harmless. The bite can lose height, though, when wear is faster or more severe, for example from:

• grinding or clenching (bruxism)
• missing molars and premolars that were never replaced
• acid erosion from diet or reflux
• teeth that developed differently from birth

When the back teeth stop supporting the bite, the lower jaw closes further than it should. Dentists sometimes call this posterior bite collapse.

How can a collapsed bite affect your jaw?

With less support at the back, more load moves to the front teeth and the jaw joints (the temporomandibular joints, or TMJ). Signs people describe include:

• jaw pain or tiredness, especially when chewing
• headaches, sometimes spreading to the scalp or neck
• pain that feels like an earache
• lower front teeth biting into the gum behind the upper front teeth
• a deep overbite that seems to be getting worse
• front teeth that are chipping or wearing quickly

These symptoms are not unique to a collapsed bite. TMJ pain has many causes, including muscle tension, stress, joint changes and injury, which is why a proper TMJ assessment comes first.

Does a collapsed bite always need treatment?

No. One point Dr. Topouzov makes in his published work is that similar-looking bites can behave very differently. Some patients with marked wear or missing teeth are comfortable and stable. For them, the right step may be to explain the findings, monitor the teeth and discuss possible future problems.

Treatment is generally considered when there is:

• jaw muscle pain or a temporomandibular disorder
• damage to teeth or gums from the way the teeth meet
• ongoing wear or tooth loss that is making the bite less stable

Dentists also use a classification (Turner and Missirlian) to group worn dentitions. In broad terms, patients who have lost bite height, often along with missing back teeth, are the ones most likely to benefit from rebuilding it. Where the bite height has not actually been lost, raising it is approached with much more caution.

Step 1: Testing a new bite with a removable appliance

The core idea in Dr. Topouzov’s approach is simple: test the new bite before making anything permanent.

He uses a removable appliance called a Gelb appliance (a mandibular orthopedic repositioning appliance). It is a clear appliance that sits over the lower back teeth, leaving the front teeth uncovered, and holds the jaw at a slightly more open, supported position.

What this stage usually looks like:

• The appliance is worn almost all the time and taken out for meals.
• Its height is set carefully at the start, then adjusted at regular visits.
• Over roughly two to four months (about six months in one published case), the jaw muscles often relax and the jaw settles into a new position.
• The height is gradually brought down to a treatment bite that is higher than the original collapsed bite but lower than where the appliance started.

In the published cases, patients’ headaches and jaw symptoms eased during this stage. That gives both the patient and the dentist useful information before committing to crowns or dentures. Results vary from person to person, and the appliance stage is also where the plan can be changed if the response is not as expected.

The articles also note that the transition can be supported with other measures where appropriate, such as home jaw exercises, massage therapy and short-term over-the-counter pain relief, with the patient’s response monitored along the way.

Step 2: Recording the tested bite accurately

Once the treatment bite feels comfortable, it has to be transferred exactly to the final dental work. This is where many complex cases become difficult.

Dr. Topouzov’s 2026 article describes a small palatal jig, a custom piece of fast-setting acrylic that rests behind the upper front teeth and acts as a stop at the tested bite height. While it is in place, the back teeth can be prepared, scanned or impressed, and the bite recorded at the right height.

For patients, the practical benefit is fewer weeks in bulky temporary acrylic crowns, which can be uncomfortable and can make the bite harder to record precisely.

Step 3: Making the new bite permanent

Without a permanent stage, a bite that was opened with an appliance tends to drift back. So the final step rebuilds the teeth to hold the treatment bite long term. Depending on the person, this may involve:

• crowns and bridges on back teeth
• a partial denture or overdenture where teeth are missing
• tooth-coloured composite to build up worn teeth
• orthodontic treatment in some cases
• a combination of these

The two case reports show how different the final plan can be. One patient chose fixed zirconia bridges on the lower back teeth. Another preferred removable partial dentures, which she had worn comfortably before. A third, in the 2026 article, had zirconia crowns, composite build-ups and a cast partial denture. The bite height was the same goal in each case; the restorations were chosen around the teeth that remained and the patient’s preferences.

The final bite is usually designed so the canines guide the jaw in side-to-side movements, which the articles link with lower chewing-muscle activity. A follow-up adjustment visit is almost always needed, and a night guard may be recommended for people who grind.

Why careful, gradual changes matter

The jaw and its muscles can adapt to a change in bite height, but sudden or large changes can cause problems of their own. The approach summarised here builds in time to adapt:

1. Assess the teeth, gums, joints and muscles, and measure the bite using more than one method, since no single method is perfect.
2. Test a new bite with a removable appliance and adjust it gradually.
3. Record the tested bite precisely.
4. Restore the teeth to hold that bite, then fine-tune and protect it.

This interest in how the jaw moves and closes goes back a long way for Dr. Topouzov. His early research in the late 1980s compared methods for finding the jaw’s centric position and recorded lower jaw movement on X-ray video. You can see the full list on his team page.

Who might benefit from a bite assessment?

Consider booking an assessment if you notice:

• jaw pain, clicking or tiredness when you chew
• regular morning headaches or earache-like pain with no ear problem found
• back teeth that are badly worn, broken or missing
• front teeth that are wearing, chipping or moving
• your lower front teeth hitting the gum behind your upper front teeth
• a denture or partial denture that no longer seems to “hold” your bite

Some of these can also signal a cracked tooth or other problem, so it is worth having them checked whatever the cause.

Bite and TMJ care in Cornwall, Ontario

At York Street Dental Centre, a bite or TMJ concern starts with listening to your symptoms and a careful exam of your teeth, gums, jaw joints and muscles. If a collapsed bite is part of the problem, we will explain what we see, whether treatment is needed now, and the options, including staged care and fixed or removable choices.

If your jaw symptoms point to something outside dentistry, we may suggest seeing your physician or another health professional as well.

Request an appointment or call us to book a TMJ assessment at our office at 118 York Street, Cornwall.

This article summarises clinical articles by Dr. Topouzov for general information. It is not a substitute for an individual examination, and treatment suitability and results vary.