My denture has broken: what should I do, and can it be glued at home?

A denture's base looks solid, but it is actually made of a brittle acrylic. This material is tough enough to carry the load of chewing for many years, but it is not resistant to a sudden knock. Dropping it, knocking it against the edge of the sink, or biting into something hard at an unexpected angle concentrates more force than the acrylic can take at a single point, and that is where it breaks. It is not metal or composite; it is not quite as brittle as glass, but it breaks in a similar way under a sudden blow.

In upper dentures, the middle of the palate is where a break happens most often. The reason is structural: the base of an upper denture is only a thin plate there, and it gets even thinner where the palatal vault, or the bony ridge in the centre of the palate, sits. When the denture is dropped or takes a blow from the front, the force usually concentrates along this line, and a straight crack forms down the middle. In lower dentures, the break is more often at the narrowest point of the horseshoe-shaped base, around the canine tooth.

Some breaks do not happen in a single moment; they build up over years. A denture flexes slightly with every bite, and this flexing becomes more noticeable once the base underneath it no longer fits well. In acrylic, this repeated flexing builds up tiny, invisible cracks, much like a wire that is bent back and forth until it finally snaps. When a denture that has been used without trouble for years suddenly breaks with no particular knock behind it, this build-up is usually the reason; it is wear, not a fall.

A break does not always happen in the base. A single tooth can come away from the body of the denture. One reason is that the tooth was not bonded firmly enough to the base during manufacture; another is a force that keeps concentrating on that one tooth, for example a single natural tooth in the opposite jaw that keeps meeting it, or a teeth-grinding habit. This kind of break can happen even when the base is sound, and it is usually easier to repair than a break in the base.

A denture breaking again and again points to something different. After a tooth is taken out, the bone underneath slowly shrinks, and over time the denture loses the base it once fitted. A denture that has lost its base no longer sits still; it rocks as you chew, and this rocking flexes the base more than normal with every bite. So the first break may be an accident, but if the same denture breaks a second time within a few months, the issue is no longer how tough the acrylic is but the fact that the base underneath it has changed. Missing this distinction and having the denture repaired again and again just puts off the real problem each time.

Certain habits directly raise the risk of a break. Chewing ice, biting a pen or your nails, trying to crack nuts in their shells with the denture, dropping it when you take it out, or putting it down on a hard surface all speed up fatigue in the acrylic. Breaks are more common in people who grind or clench their teeth, because the load on the denture is both greater and longer-lasting.

The age of the denture matters too. Over the years, acrylic absorbs and loses moisture, which changes its colour and structure slightly; it is affected by the acids in saliva and food, and in time it loses the flexibility it had on day one. A denture that is over ten years old does not respond to the same knock the way a two-year-old one does. That is why a break in an old denture is not only about how hard the knock was, but also about the denture's age.

We make this distinction after holding the denture in our hands and seeing the shape of the break and how it fits your mouth. The lists below are here to help you recognise your situation; the final decision is made after an examination.

The sequence below is usually completed in a single appointment. The aim is not just to close the break but to understand why it happened and prevent it happening again.

1. 1

   Collect the pieces and send us a photo

   Keep all the pieces of the break, provided none is missing, in a clean container. If you can, send a photo of the denture through the form; we can get an early idea of the type of break and whether a repair is possible.

2. 2

   We talk through your denture's history

   How old the denture is, whether it has broken before, and when and how it broke this time all feed directly into the decision. A two-year-old denture breaking for the first time and a ten-year-old denture breaking for the third time do not tell the same story.

3. 3

   The break is examined

   We look at whether the crack is straight or fragmented, whether the pieces fit back together exactly, and whether a tooth has been affected as well as the base. This examination determines whether a repair or a new denture is the right answer.

4. 4

   The mouth and the base are assessed

   The denture is fitted in your mouth to check whether it rocks, the bony ridge is felt by hand for its height, and any scarring from sores is looked at. In repeated breaks, this step matters more than the repair itself.

5. 5

   The decision: repair or a new denture

   If it is a one-off, clean break and there is no problem with the base, we recommend a repair. If there is a base problem, or the break is fragmented, we discuss a new denture, together with implant-supported options if needed.

6. 6

   The repair or new denture is carried out

   A simple repair is finished the same day; reinforcement that needs laboratory work takes anywhere from a few hours to a day. If a new denture has been decided on, the stages of taking impressions and try-ins begin.

The options below are chosen according to the type of break and how often it repeats. They are listed from the least invasive to the most permanent.

We are setting these out so you can see why waiting makes things harder.

The course below applies both to the path that ends with a simple repair and to the path of moving to a new denture or fixed teeth. Which one you are on becomes clear after the examination.

1. If a simple repair has been done: the same day

   If a single tooth has been rebonded, or a small crack has been reinforced, the denture is handed back the same day, or within a few hours. You can carry on wearing it straight away.

2. If a laboratory repair has been done: a day

   Aligning and reinforcing a broken base needs laboratory work. If you have a spare denture, you can use it during this time; if not, you may need to manage with soft food.

3. If a new denture has been made: two to three weeks

   The stages of taking an impression, try-ins and delivery are spread over a few appointments. Speech and chewing feel different with a new denture in the first few days, and settle within two weeks.

4. If you have moved to fixed teeth: three clinical days

   In the protocol we use, day one covers the CBCT scan, the implants, a digital impression and your first try-in teeth; day two is for try-ins and choosing the final shade; day three finishes with your final teeth being fixed in place. After that, because you are no longer carrying an acrylic base, this kind of break does not arise.

With a broken denture, there is a big difference between rebonding a single tooth and completely renewing the base. We give you the right scope once we have seen the break. These are the items that determine the scope:

The type of break

A single tooth coming away, a straight crack and a fragmented break all need different procedures, with different timescales and laboratory needs.

Repair or a new denture

If there is no problem with the base, a repair is enough. If the base is rocking or the denture has broken repeatedly, a new denture gives a more reliable result, and the scope changes.

How many times it has broken and the state of the base

With repeated breaks, the base is assessed first; relining or implant-supported options are added to the scope if needed.

Laboratory time

Simple repairs are finished the same day, while repairs that need the base reinforced require laboratory time. This affects the scope and the number of appointments.