A denture that fitted beautifully a few years ago can gradually become something you are constantly aware of, adjusting with your tongue and reaching for more adhesive. Why are my dentures loose is a question with a reassuring answer: it is almost never that the denture has changed. It is that your mouth has, and that is both normal and fixable.
On this page
- The main reason dentures loosen
- How quickly does it happen?
- Other reasons for a loose denture
- Why more adhesive is not the answer
- What can be done about it
- Can you slow the process down?
- When to come in
- What to take away
The main reason dentures loosen
When natural teeth are removed, the bone that used to support them begins to shrink. It is a process called resorption, and it happens because the bone no longer has a job to do: the roots that once stimulated it are gone.
The gum overlying that bone follows the changing shape. So the ridge your denture rests on slowly flattens and narrows over the years, while the denture stays exactly the shape it was made.
The result is a gap between the two, and a denture that rocks, slips or drops. Nothing has gone wrong; your mouth has simply moved on.
How quickly does it happen?
Fastest in the first six to twelve months after teeth are removed, which is why immediate dentures fitted on the day of extraction need adjusting and often relining within the first year. That is expected rather than a problem.
After that, change continues but far more slowly, over years rather than months. This is why most dentures need relining at some point in their working life, and why a denture that is ten years old is frequently sitting on a very different shape from the one it was made for.
Other reasons for a loose denture
- Weight loss, which changes the soft tissues of the mouth as well as everything else.
- Worn denture teeth, which alters how your bite meets and can destabilise the denture.
- A warped denture, usually from being left to dry out or cleaned in hot water.
- Dry mouth, since saliva contributes to the suction that holds an upper denture in place. Many common medications reduce saliva flow.
- Gum disease around any remaining teeth supporting a partial denture, which loosens the anchors.
- A partial denture with a broken or bent clasp.
Lower dentures are inherently less stable than uppers, because there is less surface area to grip and the tongue is constantly at work. A lower denture that has never felt secure may simply be doing what lower dentures do.
Why more adhesive is not the answer
Adhesive has a legitimate place. A small amount can add confidence to a denture that already fits well, particularly for eating in company.
What it cannot do is compensate for a fit that has genuinely gone. Using increasing amounts to hold a loose denture causes real problems: pressure gets distributed unevenly, sore spots develop, and the bone underneath is loaded in ways it was not designed for, which can accelerate the very shrinkage causing the problem.
The simple test: if you needed no adhesive when the denture was new and now use it daily, the fit needs professional attention rather than more tube.
What can be done about it
A reline is usually the answer. The fitting surface of your existing denture is rebuilt to match your gums as they are today, using an impression taken inside the denture itself. The teeth and appearance stay exactly the same; only the fit changes. It is considerably less involved and less expensive than a new denture.
An adjustment may be enough if the problem is a specific pressure point or a slightly bent clasp.
A new denture is the better investment where the teeth are badly worn, the bite has changed significantly, or the denture has been repaired repeatedly. Our post on choosing between a reline and new dentures covers how that decision is made, and our page on denture adjustment explains what each option involves.
If you still have some natural teeth, it is also worth knowing that a fixed bridge may be an option for smaller gaps, and our post on eating with dentures covers technique that helps with stability day to day.
Can you slow the process down?
Bone shrinkage cannot be stopped entirely, but a few things help.
Keep the denture well fitting, since a well-distributed load is kinder to the ridge than a rocking one. Take it out at night to give your gums a rest. Keep your remaining natural teeth if at all possible, because their roots preserve bone locally. And attend regular check-ups so the fit is assessed before it becomes a problem.
The NHS guidance on dentures covers general care.
When to come in
Sooner than most people do. Specifically if:
- You are using adhesive when you did not need to before
- The denture moves when you talk, laugh or eat
- You have developed sore spots
- Your gums bleed or feel tender under the denture
- You are avoiding foods you used to manage
- It has been more than a year since the fit was checked
A loose denture is not something to put up with, and it is rarely an expensive fix. Our post on why gums bleed is worth reading too, since denture wearers still need healthy gums.
What to take away
Dentures loosen because the bone and gum they rest on gradually change shape after teeth are removed. It is normal, it is not your fault, and it is usually corrected with a reline rather than a whole new denture. Increasing adhesive use is the signal to have it looked at.
If yours have become loose, bring them in and we will tell you honestly what they need. Ring us on 01255 422506.
This article is general information rather than personal dental advice. Every mouth is different, so please speak to your dentist about your own teeth.
