Tooth wear is one of the most underestimated problems in adult dentistry. Unlike a broken tooth or sudden pain, it advances over years — enamel thins, the biting surfaces flatten, and the height of the lower third of the face gradually decreases. This loss of "occlusal vertical dimension" (OVD) changes the way the teeth meet, how the jaw closes, and even how the face looks at rest. The published case-report research I co-authored on the evaluation of occlusal vertical dimension loss in worn dentition, in Annals of Medical Research (2020), informs how I assess and restore these cases today. At Taki Dent, restoring a worn, collapsed bite is treated as a careful reconstruction — never a cosmetic afterthought.
What "Vertical Dimension" Actually Means
Occlusal vertical dimension is the height of the lower face when the back teeth are in contact — essentially, how "tall" your bite is. It is determined by where the upper and lower teeth meet. When the biting surfaces wear away, that contact point moves closer together and the face can lose height, even though the jaw joints and muscles often compensate so gradually that the change goes unnoticed.
The visible signs of a reduced OVD are recognisable once you know what to look for: a shortened, "sunken" appearance to the lower face, deepened folds at the corners of the mouth, a chin that appears closer to the nose, and teeth that look short and squared-off rather than showing their natural length when smiling.
Why Teeth Wear Down: The Etiology Matters
Before any restoration is planned, the cause of the wear must be identified — because rebuilding the teeth without addressing the cause invites the same problem to recur. Tooth surface loss is rarely the result of a single factor; usually several act together. The main mechanisms are:
Attrition
Tooth-to-tooth wear, most often from clenching and grinding (bruxism). The biting surfaces of opposing teeth flatten against one another over time.
Erosion
Chemical loss of enamel from acids — dietary (citrus, fizzy drinks, wine) or from acid reflux. Erosion softens enamel, which then wears far more quickly.
Abrasion
Mechanical wear from outside the bite — aggressive tooth-brushing, abrasive toothpaste, or habits such as holding objects between the teeth.
Abfraction & loss of teeth
Flexural stress at the gum line, often combined with missing back teeth that overload the remaining ones — accelerating wear on the teeth that are left.
In my clinical experience, and as reflected in the worn-dentition cases I have documented, the most severe collapse tends to appear where a grinding habit combines with acid exposure or with teeth lost at the back of the mouth. Identifying which combination is at work is the first step of treatment — not the last.
Diagnosis: Measuring a Collapsed Bite
The central diagnostic question is whether vertical dimension has truly been lost, or whether the teeth have worn while the body compensated by erupting them further — keeping the face height stable. The distinction completely changes the treatment plan. Assessment combines:
- Rest position measurement: Comparing the lower-face height when the muscles are relaxed against the height when the teeth are together. The difference (the 'freeway space') tells me whether there is room to restore lost height.
- Facial and photographic analysis: Documenting lip support, the visible length of teeth at rest and on smiling, and the proportions of the lower third of the face.
- Mounted study models: Plaster or digital models mounted on an articulator let me study the bite away from the mouth and plan exactly how much height to rebuild.
- Diagnostic wax-up and trial restoration: A mock-up of the proposed new bite — often worn temporarily — so both the patient and I can confirm comfort, speech, and appearance before anything permanent is made.
Restoring the Lost Height: Treatment Options
Reopening a collapsed bite must be done in a controlled, reversible-then-definitive sequence. The choice of restoration depends on how much tooth structure remains, whether teeth are missing, and the patient's wishes. The case reports I co-authored in Annals of Medical Research illustrated how the approach is tailored to each patient when diagnosing and rehabilitating occlusal vertical dimension loss in a worn dentition.
Overlay & Removable Solutions
An overlay removable prosthesis sits over the worn teeth and rebuilds the biting surface, restoring height without aggressively cutting down the remaining tooth structure. It is a valuable, more conservative option — particularly where teeth are missing as well as worn, or as a staged step before definitive fixed work.
Fixed Crowns & Onlays
Where enough sound tooth remains, individual crowns or onlays in zirconia or lithium disilicate rebuild each tooth to its correct height and shape. This is the route most patients associate with a full-mouth reconstruction — strong, natural-looking, and long-lasting when the bite has been planned correctly.
Implant-Supported Restorations
When back teeth have been lost and overloading drove the wear, dental implants re-establish posterior support — protecting the rebuilt front teeth from the forces that damaged the original ones. Restoring the back of the mouth is often the key to a stable, lasting result.
A worn dentition is rarely a single-tooth problem, so these cases frequently form part of a wider treatment plan. My article on full-mouth reconstruction planning sets out how the whole bite is sequenced, and the comparison of zirconia and E.max restorations explains how the right material is chosen for rebuilding worn teeth.
Protecting the Result
Whatever the restoration, it will only last if the original cause of the wear is managed. For patients who grind, a custom night guard is essential to shield the new restorations from the same forces that wore the natural teeth. Where erosion was the driver, dietary advice and management of any reflux are part of the long-term plan. A rebuilt bite is a structure that has to be maintained, not simply fitted and forgotten.
This emphasis on diagnosis, cause, and durable design runs through my wider research on prosthodontics and implant care. You can review the full body of peer-reviewed work on the publications page, or read more about the research and clinical approach of Dr. Sadık Taki.
Restoring a collapsed bite is, in the end, an exercise in restoring function and confidence together. Done carefully — with the cause understood, the new vertical dimension tested before it is finalised, and the result protected — a worn dentition can be rebuilt to look natural, feel comfortable, and last.