Why Do My Dentures Keep Slipping?
If you’ve ever found yourself asking “Why do my dentures keep slipping?”, you’re certainly not alone. Denture movement is one of the most common frustrations denture wearers experience—particularly with lower dentures. The good news is that slipping dentures are rarely something you just have to “put up with”. In most cases, there is a clear reason why it’s happening and practical ways to improve stability and comfort.
Below, we’ll break down the most common causes of slipping dentures, why lower dentures are especially problematic, and what can be done to help.
Why Lower Dentures Slip More Than Upper Dentures
Lower dentures are notoriously difficult to stabilise because:
- There is less surface area for suction
- The tongue and floor of the mouth are constantly moving
- Bone in the lower jaw tends to resorb (shrink) more quickly after tooth loss
If the ridge of bone in the lower jaw is very flat or has fully resorbed, even a perfectly made denture can still struggle to stay in place.
👉 This is an important point: a denture can fit well but still lack retention.
Common Causes of Slipping Dentures
1. Severe Bone Loss (Resorption)
When the jawbone has shrunk significantly, there’s simply less structure for the denture to grip onto. This is one of the most common reasons lower dentures slide or tip, especially when chewing.
You may notice:
- Dentures lifting when biting on one side
- Dentures sliding sideways
- Difficulty eating firmer foods
2. Dentures That Are Overextended
Sometimes dentures are made slightly too long:
- Lower dentures may extend too far under the tongue
- Upper dentures may extend too far into the cheeks
When the tongue lifts or cheek muscles engage during eating, these overextended areas can push the denture out of place.
This is a very common issue—and often fixable with simple adjustments.
3. Poor Tooth Positioning on the Denture
The position of the teeth on the denture matters just as much as the base:
- Teeth placed too far outside the ridge can cause tipping
- Chewing pressure becomes uneven
- One side lifts when the other side bites
A skilled Clinical Dental Technician will often move the teeth closer to the ridge to reduce this leverage effect and improve stability.
4. Bite Problems Between Upper and Lower Dentures
If there is significant bone loss at the front of the mouth, biting can cause a see-saw effect, where:
- The back of the denture lifts
- The denture tips or slides forward
- Stability is lost during chewing
In some cases, this can be improved with relines, bite adjustments, or alternative retention options.
5. Dentures Needing a Reline
Over time, your mouth changes shape—but your denture doesn’t.
A reline adds material to the fitting surface of the denture to rebuild lost contact areas, helping improve:
- Fit
- Comfort
- Retention
Relines are often overlooked but can make a huge difference.
Do You Just Need to “Get Used to” Dentures?
There is a short adjustment period with any new denture. Learning:
- Where you can bite safely
- How to chew evenly
- How to control movement
However, persistent slipping is not something you should ignore or simply accept as normal—especially if it’s affecting your confidence or ability to eat.
Are Dental Implants an Option for Slipping Dentures?
For many people, implants are one of the most effective solutions for unstable dentures.
Contrary to popular belief:
- You don’t always need lots of implants
- Dentures can still be removable
- Even one or two implants can dramatically improve stability
Implants act like anchors, allowing the denture to clip into place rather than relying purely on suction.
That said, implant suitability depends on:
- Bone height
- Bone density
- Nerve position
- Overall oral health
A proper assessment is essential.
When Dentures Are Made Correctly but Still Slip
This can be frustrating—but it happens.
Even a technically perfect denture can struggle if:
- The ridge is completely flat
- Muscle forces overpower retention
- Bone loss is severe
In these cases, implant-retained dentures often provide the biggest improvement in comfort and confidence.
What Should You Do If Your Dentures Keep Slipping?
The most important step is getting a professional assessment.
A Clinical Dental Technician can:
- Check fit and extensions
- Assess tooth positioning
- Identify bite issues
- Advise on relines or adjustments
- Discuss implant-retained options if appropriate
There is rarely a one-size-fits-all answer—but there is almost always a way to improve things.
Final Thoughts
If your dentures keep slipping, it doesn’t mean you’ve failed—or that dentures “just don’t work for you”. It usually means something needs adjusting, relining, or re-thinking.
Whether the solution is a simple tweak or a more advanced option like implants, you don’t have to struggle in silence.
Getting expert advice can make the difference between constantly battling your dentures and finally feeling comfortable and confident again.