Are my dentures supposed to move?
Short answer: A little movement is normal, especially with a lower denture, which has far less to hold onto than an upper. Movement that makes eating or speaking difficult, or that rubs sore spots, is not normal — it usually means the denture no longer matches a jaw that has changed shape, and it can be relined, remade, or stabilised with implants.
Why a good denture stops fitting
Nothing has gone wrong with the denture. The jaw underneath it has changed.
When teeth are removed, the bone that held them slowly resorbs, and it keeps doing so for years. A denture is moulded to the shape of the ridge on the day it was made — as the ridge shrinks, the fit that was once precise becomes approximate.
This is also why lower dentures are harder. An upper denture has a broad palate to seal against; a lower one sits on a narrow ridge with a tongue and cheeks moving against it, so it has much less to hold it.
What can be done
- Adjustment. For a specific sore spot, easing the denture at that point often solves it in one short appointment. Never file it yourself — it is very easy to ruin the fit.
- Reline. New material is added to the fitting surface so it matches the current shape of the ridge. Much cheaper than remaking, and the usual answer for a denture that has simply become loose.
- Remake. Where the denture is worn, the teeth have worn flat, or the shape has changed too much to reline.
- Implant-retained denture. Two or more implants with clips the denture snaps onto. For a persistently loose lower denture this is often transformative, and it needs fewer implants than replacing teeth individually.
On adhesives: they are a reasonable aid for a well-fitting denture, but they are not a fix for a loose one. Needing more and more adhesive is the signal to get the fit checked, not to buy a bigger tube.
Do not ignore sore spots
An ulcer under a denture that keeps recurring in the same place needs looking at. Constant rubbing damages tissue, and any sore area that has not healed within two weeks should be examined — that is a general rule about the mouth, not only about dentures.
Take the denture out at night unless told otherwise. The tissue needs time without pressure, and leaving dentures in overnight raises the risk of fungal infection.
Common questions
Why has my denture become loose?
Because the bone ridge underneath has continued to shrink since the denture was made, so the shape it was moulded to no longer matches. It is usually fixed by relining rather than remaking.
Is denture adhesive a permanent solution?
No. It is an aid for a denture that already fits reasonably. Needing steadily more adhesive means the fit needs assessing.
Can implants hold a loose denture in place?
Yes. Two or more implants with clips the denture snaps onto can transform a loose lower denture, and it requires fewer implants than replacing teeth individually.
Should I sleep with my dentures in?
Generally no. The tissue needs time without pressure, and wearing dentures overnight increases the risk of fungal infection. Follow your dentist’s advice if you have been told otherwise.
Can I file down a denture that is rubbing?
No. It is very easy to ruin the fit, and the sore spot is often not where you think. Adjustment is a short appointment.