Not always a receding gum: sometimes hard tissue is being lost
- Run a fingernail across the gum margin. Smooth, with no step, is usually a receded gum; a palpable step means lost hard tissue.
- • Exposed tooth necks pose two questions, not one. You can spot features of both yourself, but recession and a cervical lesion can coexist; the diagnosis is made in the surgery.
- The distinction decides who treats it: a receded gum goes to a periodontist, a cervical lesion to a restorative dentist. One treatment does not substitute for the other.
- A receded gum does not grow back, and no toothpaste or mouthwash rebuilds lost hard tissue. Pain that has gone does not mean the change has stopped.
- This article deals only with telling the causes apart. Treating recession, the mechanism of erosion and the pain itself each have an article of their own.
Where does enamel end and the root begin?
Usually just under the gum margin, at a place that in a healthy mouth simply is not visible. The crown of the tooth is covered by enamel, and the root is covered by cementum - a layer far thinner than enamel and far less resistant both to acid and to friction. The place where one passes into the other is called the cementoenamel junction. Beneath both lies dentine, threaded with microscopic dentinal tubules, and it is dentine, exposed at the neck, that responds to cold with pain.
A tooth neck becomes visible in two ways. Either the gum margin moves towards the root and uncovers what it had been covering; a dentist calls that retreat recession. Or the gum stays exactly where it stood, while the tooth tissue itself is lost and a notch forms at the junction. In both situations the patient says exactly the same thing: that they have exposed necks of teeth, that their teeth look longer and that their tooth necks hurt from cold.
The first situation is a soft tissue problem and is assessed by a periodontist, a specialist in gums; the second is a hard tissue defect, and there the work-up begins with the question of what is taking that tissue away.
Nearly nine in ten participants had a receded gum by at least one millimetre, and the proportion rose with age. That is what a cross-sectional study in seven European countries found; it is more than most earlier papers report. Exposed tooth necks, even by a single millimetre, are therefore the norm in adulthood, not an alarm signal in themselves. The alarm is the rate of change - how much more root is visible than a year ago.
Check it in the mirror: three observations at the gum margin
Make them in daylight, on a tooth dried with a tissue.
- Fingernail. Run it gently across the gum margin, from below upwards. A smooth, continuous surface speaks for an exposed root, whereas a palpable step, groove or hollow speaks for a cervical lesion.
- Colour. The root is warmer in shade, matt and yellowish, whereas enamel is lighter and clearly glossy, and the boundary between the two is sometimes visible as a horizontal line.
- Distribution. Count how many teeth the change involves and on which side. One tooth, one side and the whole arch - three different trails.
Take a photograph with your phone, from the same distance and in the same light, then repeat it in six months.
When the picture comes out ambiguous, take that photograph and book a check-up. With an exposed tooth neck there are things visible in the surgery that a mirror does not show.
Four differences you can see in the mirror
| What you assess | The gum has receded | Hard tissue has been lost |
|---|---|---|
| Edge at the gum | smooth, continuous, no step under the fingernail | palpable step, groove or saucer-shaped hollow |
| Outline of the tooth | complete; the tooth looks longer but untouched | wedge-shaped notch or flattening right at the junction |
| Gum margin | moved towards the root, evenly and in an arc | stands where it stood; the change lies above it |
| Distribution along the arch | most often canines and premolars on one side | either many teeth at once in both arches, or a single tooth in isolation from its neighbours |
None of these four points is sufficient on its own. When the picture is mixed, the step under the fingernail may speak for lost hard tissue, but it does not rule out recession alongside it; the examination in the surgery settles that. With an exposed tooth neck a mixed picture is in fact sometimes commoner than either pure one. Dentine hypersensitivity is associated both with a receded gum and with a worn cervical surface, and it affects the buccal surfaces of teeth more often than the lingual ones, that is, exactly the surfaces visible in a mirror. That is how the second publication from the same European study came out. All the more reason to look at all four points.
What in the picture speaks for a receded gum rather than a lesion?
Four signals that can usually be looked at in a mirror. A receded gum arises from a disproportion between two things: there is too little bone under the gum, and force acts on the gum.
- The gum over the root is thin and translucent, so that the outline of the root shows through it; this is the thin phenotype, in which the bony plate is in places too scant.
- The tooth stands ahead of the arch or is tipped outwards, typically with crowding and after orthodontic movement that pushes it outwards.
- The change is on one side, more often the side opposite the dominant hand, which usually goes together with greater pressure during brushing on that side.
- A frenum pulls at the gum margin, or a lip piercing rests against it.
The popular message about the hard toothbrush is more confident than the data it stands on. Those data come from observational studies. Material of that kind shows only that one thing goes together with another, and does not prove a causal relationship, that is, that the first brings about the second. This does not mean that the brush itself is of no consequence; it means only that such data do not allow one to read off how much of the receded gum is its doing. The cautious advice runs as follows: change your technique and press more lightly, because it costs nothing; do not expect, however, that changing the brush will reverse the change.
Recession also arises by a separate route in the course of periodontitis, in which the gum recedes together with the bone supporting the tooth; that is a different mechanism, a different prognosis and different treatment, described in the article on gum recession and when surgical treatment is needed.
Where does a defect on the tooth neck itself come from?
Usually from three factors at once: mechanical friction, acid and, possibly, loading during biting. Which of them predominates is hinted at by the distribution of the changes: acid leaves its mark on many teeth at once and on the side it washes over, loading usually on single teeth, friction on the side opposite the dominant hand. The distribution alone, however, is a trail and nothing more.
Non-carious cervical lesions were present in six in ten participants of a study in Tokyo (1,108 people aged 15 to 89). Their frequency rose with age. There they were associated with carbonated drinks, citrus juice, acidic fruit, the force of pressure during brushing and with bruxism, that is, grinding or clenching the teeth, although the study does not settle which of these weighs most in a given individual.
Acid holds a particular position in this set, because it softens the surface before anything else abrades it. Its source is sometimes the diet, but also gastro-oesophageal reflux, which in studies of young soldiers in Singapore and of adults in Lithuania was among the factors associated with erosive tooth wear. The chemical mechanism itself and the full list of acid sources are described separately in the article on enamel erosion.
Here lies the most interesting contested point in the whole subject. Teeth flex at the neck under the load of biting, but whether that flexing chips tissue away, nobody has so far settled. The counter-argument does not close the matter either, because cervical lesions have already been found in skulls from before the era of the toothbrush, though rarely, so brushing alone does not explain them.
For practical management this means that in a given patient it cannot today be said which of the three factors weighs most. Management therefore begins with limiting all three at once: soft bristles and a sweeping rather than a horizontal movement, waiting before brushing after an acidic meal or drink, assessment of the occlusion and of night-time clenching by a clinician. Only observation over a dozen or so months shows whether some factor has been overlooked.
Can exposed tooth necks be recognised without a dental surgery?
Yes, but only in one matter out of three. A mirror and a fingernail can give first pointers, but they do not settle whether there is recession, a defect in the tooth, or both; the diagnosis and the cause are established in the surgery.
Yes, but only in one matter out of three. A mirror and a fingernail can give first pointers, but they do not settle whether there is recession, a defect in the tooth, or both; the diagnosis and the cause are established in the surgery.
Pain is the least reliable of all.
In the same European study, any response to a blast of air occurred in three in four participants, a marked one in roughly three in ten, and the frequency fell after the age of forty. Receding gums and cervical wear, meanwhile, go on building up. Absence of pain is therefore not proof that the change has stopped. An exposed root also carries its own, silent risk: the number of exposed root surfaces was one of the risk factors for root caries in a study of people over sixty. A root decays more readily than enamel, so an exposed tooth neck must not be skipped over with the brush; it needs to be cleaned more gently, not less often.
Come to the surgery without waiting for a check-up if the gum bleeds on brushing, a tooth starts to move, the change builds up over the course of a few months, or it hurts on touch alone. Without any of these symptoms the change usually does not call for an urgent visit, but it should still be brought to the next examination.
Two causes, two different treatment pathways
When the gum has receded, the matter belongs to periodontal treatment. The gum does not grow back on its own. The extent of coverage that is possible, the techniques and their outcomes are described separately in the article on the connective tissue graft (CTG).
When hard tissue has been lost, the pathway looks different: first the cause is limited, and only then is the defect restored, and reversing that order is sometimes the commonest reason why a filling on a tooth neck does not last. During the work-up the pain itself can often be damped down: a desensitising toothpaste used daily, and additionally rubbed in with a finger at the painful spot at night, is sometimes enough. How this works and what else helps is described in the article on tooth sensitivity. Weaker pain does not, however, stop the loss of tissue.
The distinction itself also decides who leads the treatment, because exposed tooth necks go to two different surgeries in our clinic.
In treating patients at our practice in Warsaw's Wola district, we pay particular attention to having the diagnosis settled before the procedure is chosen. A procedure matched to the wrong cause is not a half-measure - it is lost time and irrecoverably lost tissue.
Consult your case with an expert and get your treatment plan
Frequently asked questions
Does an exposed tooth neck always hurt?
No. Some exposed roots are entirely painless, probably because the tubules in the dentine close over time. Absence of pain does not, however, mean that the process has stopped. Hypersensitivity is sometimes an early symptom that passes, while the change itself goes on building up. Such a tooth neck still requires periodic review in the surgery.
Can a gum grow back on its own?
It does not grow back. Once lost, the height of gum and bone does not return without a procedure. Some recessions can be covered with a connective tissue graft, and the extent of coverage depends on the state of the tissues between the teeth. Whether this is feasible in a given case, and to what extent, will be shown only by measuring the tissues in the surgery; it is not visible in a mirror.
Does a hard toothbrush really make gums recede?
The data are weaker than the popular message suggests. Observational studies link the force of pressure with defects at the tooth neck, and hard bristles with erosive tooth wear, but they do not prove that the brush itself makes the gum recede. The more cautious and cheaper conclusion runs as follows: change your technique to a sweeping movement and press distinctly more lightly than you have been doing.
Will a filling on a tooth neck hold?
It holds longer when the cause of the defect has first been limited. A filling here works at the boundary of enamel and root, at the place where the tooth flexes and where acids run down. If acid or loading go on acting, the restoration comes away again. That is why with a filling that repeatedly debonds, one looks first for acid and loading, not for a new material.
What will I feel in the first days after a tooth neck is restored?
Often a clear improvement in the response to cold on the very first day. Sometimes the improvement comes only after a few days of increased sensitivity. The gum next to a new filling is sometimes reddened for a few days and tender on brushing. If after a week the pain on cold returns or builds up, that calls for review, not for waiting.
Is a desensitising toothpaste enough in the longer run?
Toothpastes act on the symptom and require continuous use; after stopping, the symptom usually returns. They halt neither the recession of the gum nor the loss of tooth tissue, so they are suited as temporary support during the work-up, but not as a definitive solution when exposed tooth necks are progressing.
The same visible tooth neck, two different decisions
Exposed tooth necks are judged by the rate of change, not by how large they are today: how much root is visible says less than whether more of it is visible than a year ago. And whether the matter goes to a periodontist or to restoration of a defect, you will learn only from measurement at the tooth.
Read more:
- Periodontist in Warsaw Wola — periodontal treatment at Modern Dental & Orthodontics
- Gum recession — why the gum recedes and when surgical treatment is needed
- Tooth sensitivity - why cold hurts and what actually helps
- Enamel erosion: why teeth are disappearing without decay and without grinding
- Connective tissue graft (CTG) — how to cover exposed root surfaces
Content and liability disclaimer
This article is informational and educational in nature and does not constitute medical advice, a diagnosis or a therapeutic recommendation — it does not replace a consultation with a specialist. If you are experiencing symptoms, have doubts or are facing a decision about treatment, consult a dentist. The methods described and the data cited are general in nature. The results of scientific studies relate to populations, not to an individual patient. The course and outcome of therapy depend on the individual clinical situation and may vary between patients. No information contained in this article constitutes a guarantee of result. The content has been prepared with due care, based on publicly available medical knowledge and the scientific publications indicated in the Sources section. We do not advise taking or refraining from any health-related action solely on the basis of the content of this article, without prior consultation with a doctor.
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