What happens to the bone after a tooth is removed?
It recedes, and faster than most patients expect.
The socket, that is the bony chamber in which the root sat, is lined with a thin layer of bone which, without the tooth, has nothing left to hold and disappears within a few months. What is lost above all is the outer wall, called the buccal wall, on the side of the lip or the cheek, usually the thinnest in the whole alveolar ridge, that is the bony ridge in which the roots of the teeth sit.
The change does not spread evenly over all the walls. The ridge goes on narrowing also where the socket has been preserved - less than in a socket left to itself, but it narrows. The shape of the bone that the implant surgeon will find in six months is settled mainly in the first months after the extraction. The years without a tooth that follow change it much more slowly. That is why the window in which anything can be done at low cost is short, and it opens on the day of the procedure. We describe the phenomenon itself separately: bone loss after tooth loss.
If the tooth was removed a few weeks ago, it is already too late for ridge preservation. What remains then is bone reconstruction after the removal of the tooth, before the implant is placed or together with it, and its extent is shown by a CT scan.
What to ask before the extraction, and what to plan for that same appointment
These questions make sense only before the procedure; asked a week later they concern a different clinical situation.
- Are we planning an implant in this place, and if so, roughly when?
- How thick is the outer bone wall at this tooth, and is it visible on the CT scan?
- Is the wall of the socket whole, or has infection or a cracked root destroyed it?
- Can an implant be placed straight away, on the same day, and if not, is it worth filling the socket with a bone substitute material that day?
- Is ridge preservation charged separately from the removal of the tooth itself?
- What will I see and feel during the first two weeks after the procedure?
Until it is known whether an implant is planned and what the bone wall looks like, the remaining questions have no one to address yet.
Three paths from a single day: what is chosen at the removal of a tooth
The procedure itself is the filling of the empty chamber left by the root with a bone substitute material and closing it with a membrane or a collagen matrix, carried out at the same appointment as the removal of the tooth; in the literature it goes under the names alveolar ridge preservation and socket preservation.
Three possible endings to this conversation: Spontaneous healing, when there is no plan for an implant. Immediate implant placement, when the bone wall is thick and undamaged and the root fits within its outline. Alveolar ridge preservation before an implant, when an implant is planned and the wall is thin or damaged.
Question one: is an implant to stand in this place? No, or it is not yet known → spontaneous healing. The socket stays empty and fills with the patient’s own tissue. Yes → question two.
Question two: is the outer wall of the socket whole? No, there is a defect left by an abscess, a cyst or a cracked root → alveolar ridge preservation before an implant. An implant would have no support in the bone that day, and an empty socket with a missing wall collapses particularly badly. Yes → question three.
Question three: is the wall thicker than a millimetre, and does the root fit within the outline of the bone? Yes → immediate implant placement comes into play; one procedure takes the place of two and shortens the treatment by months. No → alveolar ridge preservation before an implant, because a thin wall is the situation in which this procedure gives the most. An exception, whatever the answer: a molar in the maxilla → ridge preservation. The socket there is wide and lies just below the sinus, so an implant on the same day rarely comes into play, and the collapse of the bone usually forces a sinus floor elevation later, that is a separate and more difficult procedure.
What the middle path gives: after the socket has been filled with bone substitute granules of bovine origin, that is the processed mineral part of bone, the ridge narrows roughly a millimetre less than with spontaneous healing. The order of magnitude at stake can be seen in maxillary sockets after teeth other than molars, left to themselves: there the ridge narrowed over fourteen weeks by an average of 2.84 mm, measured a millimetre below the bone crest. The two figures come from different publications.
With an implant placed on the day the tooth is removed, the gap between the implant and the wall of the socket is also filled with a bone substitute material, and the outer wall then loses about half a millimetre less than without the filling. Surgeons rated this procedure as clearly more difficult technically than placing an implant into a healed socket; they rated it in a multi-centre randomised trial. It is therefore not an easier path, only a shorter one.
What the procedure and the healing look like
For the patient it is a few minutes added to an appointment at which the tooth is being removed anyway.
Once the root is out, the dentist cleans the socket, fills it with bone substitute granules and covers it with a membrane or a collagen matrix, so that the material does not wash out into the mouth. Sutures close the whole.
Normal healing of the socket after a tooth has been removed we describe separately, because the picture in the mirror can be misleading in those days. In another text we have gathered aftercare following a tooth extraction for the first days after the procedure.
The procedure also has its own risk of failure. The membrane can become exposed, and the material that has been placed can become infected; it then has to be removed and the bone rebuilt later, in conditions worse than after ordinary healing. This does not mean that a complication rules out an implant. It puts it off.
Sockets filled with a bone substitute material had, in samples taken after four months, less new bone than sockets left to themselves: about a quarter of the sample against almost half. That figure alone does not, however, say whether a bone substitute material hinders healing. At that point it has simply not turned into bone yet: it occupies space, supports the wall from the inside and is replaced slowly, over many months. From the perspective of the clinical team at Modern Dental & Orthodontics (Klinika MDO), what matters is that the patient leaves the practice with the right expectation: the procedure promises a smaller collapse of the bone, not an excess of it.
There is nothing to outbid anyone on in the bone substitute material itself: more expensive granules did not give a better result in studies than cheaper ones.
Whom will alveolar ridge preservation before an implant help, and who will gain little from it?
The person whose outer bone wall is a millimetre thick or thinner, or damaged. That is what follows from maxillary sockets after teeth other than molars, with intact walls, left to themselves. Additional bone reconstruction would be needed there, according to implant planning on a CT scan, at close to nine sites in ten where the wall was a millimetre thick or thinner, and at roughly one in three where it was thicker.
The second factor is visible on the same pre-extraction CT scan: the position of the root. Where it protruded beyond the outline of the ridge, additional reconstruction was needed in those same sockets at close to nine in ten, against four in ten where the root fitted within the bone. The two factors usually go together: a root outside the outline has a thinner wall.
A similar direction is seen after teeth with extensive bone loss from periodontal disease, where ridge preservation made it possible to keep a greater height of the bone crest and less often ended in bone being added. There are, however, few papers on this, and their authors rated the certainty of the evidence as very low to low.
The second group in which the benefit can be large is molars in the maxilla. In a trial on posterior teeth, after spontaneous healing, sinus floor elevation in the maxilla was needed in six of the nine sockets, and an implant shorter than 8.5 mm was placed at seven sites in ten. After ridge-preserving procedures there was less of both. This was statistically confirmed only for sinus floor elevation and only with one technique; the difference in implant length was not confirmed for any.
Now the other side of the account, because without it the picture is dishonest. After ridge preservation with a bone substitute material of bovine origin, the chance that the implant would then stand in bone abundant enough that nothing would have to be added anywhere rose by 6 to 19 percentage points compared with spontaneous healing, and the less so the thicker the implant. With the thickest implant the gain was not statistically confirmed.
The authors of that analysis summed the matter up in a sentence worth hearing before the decision: in four cases out of five, either the procedure was not needed at all, or bone reconstruction will prove necessary anyway. Those same four cases divide into two different groups: some sockets did not need the procedure, some need something more despite it. Only the first of those two questions can be settled before the extraction.
Additional bone augmentation before an implant was needed in roughly one socket in six despite the preservation that had been carried out; that is how a separate randomised trial came out.
Alveolar ridge preservation before an implant is therefore not an insurance policy, only a shift in the odds. Planning procedures of this kind is led by dental surgery together with the dentist who will be placing the implant.
How the date of the future implant is planned
The date is set by the CT scan, and the number of months since the extraction is only a starting point.
Mineralised tissue in the socket increases with the months, and the remnants of the bone substitute material that was placed decrease, although this was not statistically confirmed; the ridge itself, however, went on narrowing, and the proportion of sites requiring additional bone reconstruction did not fall as the interval was lengthened. Waiting therefore improves the quality of the tissue inside the socket and does not protect against the change of shape on the outside. For the patient the one merges with the other into a single expectation, while in the socket these processes run separately.
The dentist checks the width of the ridge and the thickness of the buccal wall on the CT scan, and only then sets a date. If the picture after four months is good, there is no reason to wait longer. If it is not, another three months will usually not repair it, and the conversation moves on to bone reconstruction after the removal of the tooth.
In the anterior maxilla, six months after the removal of the tooth and ridge preservation, in the group with delayed implant placement a panel of five assessors judged soft-tissue augmentation to be needed in roughly one third of cases. The procedure protects the shape of the bone and does not take the place of work on the gum, where the appearance of the tooth in the smile line is concerned.
Consult your case with an expert and get your treatment plan
Frequently asked questions
Is alveolar ridge preservation the same as an implant straight away?
No. Alveolar ridge preservation before an implant fills the chamber left by the root with a bone substitute material and puts the placement off by a few months. An immediate implant introduces the implant into that same chamber on the same day. These are two different paths from one moment of decision, with different conditions of entry, concerning above all the state of the bone wall.
Will there always be enough bone after the procedure?
Not always, and nobody guarantees it. The procedure reduces the collapse of the ridge, but does not stop it. Some patients, despite a preserved socket, need additional bone reconstruction on the day of placement. The probability depends above all on the thickness of the outer bone wall before the tooth is removed, and on the position of the root.
How long does the material in the socket take to heal?
The gum over the socket usually closes within two weeks. The remodelling of the material into bone takes much longer, and after four months its remnants are still visible in a sample that has been taken. That does not, however, settle the date: an implant is usually placed after four to six months - the exact date is decided by the CT image.
What is the material that fills the socket made of?
Usually it is granules of bovine origin: the mineral part of animal bone, processed industrially so as to remove the proteins from it. Some preparations contain added collagen. Synthetic materials and the patient’s own bone are also available. The choice is decided before the procedure - so it is worth asking about it at that same appointment.
Can every tooth be preserved in this way?
Not every one, and not in every state. Extensive destruction of the walls of the socket, active purulent inflammation, and certain general diseases and drugs affecting bone change the plan. Smoking worsens healing and is a factor over which the patient has direct influence. The decision is made by the surgeon after assessing the CT scan and the history, and in general diseases after a conversation with the treating doctor.
What does the healing of the socket look like in the first two weeks after the procedure?
For the first few days the area can be swollen and tender, and a white coating of fibrin appears on the sutures, which is not pus. Single grains of the material can float out from under the sutures. We describe aftercare following a tooth extraction separately. Pain increasing after the third day, fever or heavy bleeding are reasons to contact the practice without waiting.
After how many months from ridge preservation is an implant placed?
Most often after four to six months. A shorter interval can be possible when the CT scan shows good remodelling, and a longer one does not improve the shape of the ridge and does not reduce the chance of additional bone reconstruction. The date is set after the image has been assessed, not according to a fixed calendar.
Most bone is lost in the first months, not in the first years
The whole urgency of the subject follows from that one sentence. The conversation about ridge preservation has a shorter shelf life than the extraction itself - it ends at the moment the wound is stitched - and nobody will remind you of it afterwards. If the bone wall is thick and undamaged, giving up the procedure is not a mistake. If it is thin and an implant is planned, leaving that conversation out usually shifts the cost onto later bone reconstruction, carried out in more difficult conditions.
Read more:
- Dental Surgery in Warsaw Wola
- Jawbone loss after tooth loss — what happens and why time matters
- Bone augmentation before an implant — when is it necessary and what types are available?
- Blood clot after tooth extraction — what a normally healing socket looks like
- Tooth extraction aftercare: washing your hair, sleeping, work, sick leave and smoking
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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