If you wear plastic dentures and have noticed a faint clicking or clacking sound when you speak — particularly when saying words with the letter "S" — you are certainly not alone. This is one of the most commonly reported concerns among denture wearers, and it often prompts people to search online for reassurance and answers.
The clicking sound from dentures during speech is typically related to how well the denture fits against the gum tissue and underlying bone, as well as how the tongue interacts with the denture surface during articulation. While the sound can feel embarrassing or frustrating, it is usually a sign that something about the fit or positioning of your dentures deserves a closer look.
Understanding why denture clicking happens — and what can be done about it — is the first step towards finding a practical solution. This article explains the most common causes, what the dental science tells us, and when it may be appropriate to consult a dental professional for a review.
At a Glance
Denture clicking during speech is most commonly caused by ill-fitting plastic dentures that shift slightly as the tongue and lips move. When dentures are loose, they momentarily separate from the gum tissue and snap back, creating an audible click. Words with "S" are particularly affected because they require precise tongue-to-palate contact.
What Causes Denture Clicking When Speaking?
The most straightforward explanation for denture clicking is that the denture is not fitting as securely as it should. Plastic dentures — particularly full (complete) dentures — rely on suction and close contact with the gum ridges to remain stable. When this contact is lost, even slightly, the denture can lift or shift during the complex muscle movements involved in speech.
Several factors can contribute to this:
- Bone resorption over time: After tooth loss, the jawbone naturally begins to shrink. This is a gradual process, but over months and years it can significantly change the shape of the gum ridges that support a denture. A denture that fitted well when first made may become progressively looser as the underlying bone changes.
- Natural wear and ageing of the denture material: Acrylic plastic dentures are durable, but they are not permanent. Over time the base can warp subtly, affecting the precision of the fit.
- Changes in body weight: Significant changes in weight can affect the soft tissue volume in the mouth, altering how a denture sits.
- Insufficient retention for lower dentures: Lower (mandibular) dentures are inherently more difficult to retain because they sit on a smaller ridge and are subject to tongue movement.
Understanding these root causes helps explain why clicking tends to become more noticeable over time, even if a denture initially felt comfortable.
Why "S" Sounds Are Particularly Affected
From a dental and phonetic perspective, sibilant sounds — those that produce a hissing quality, such as "S", "Z", "SH", and "CH" — require very precise positioning of the tongue against the palate. For natural teeth, this positioning is guided by the teeth themselves and the hard palate.
When you wear a plastic denture, the acrylic base alters the shape of the roof of your mouth and the positioning of the artificial teeth. If the denture is even slightly loose, the tongue's movement during these sounds can cause the denture to shift momentarily. This micro-movement creates the clicking or clapping noise.
New denture wearers almost always experience some speech adaptation, which typically improves over several weeks as the tongue and facial muscles learn to accommodate the new appliance. However, persistent clicking — especially in patients who have worn dentures for some time — often suggests a fit-related concern that warrants professional review.
If you are newly fitted with dentures, exploring the process of getting dentures at MD Dental can provide helpful context about what to expect during your adjustment period.
The Dental Science Behind Denture Fit and Stability
Denture retention relies on three primary forces: adhesion (the thin film of saliva between the denture and gum tissue), atmospheric pressure (suction), and muscular support from the cheeks, lips, and tongue. When these forces are working effectively together, the denture remains stable during eating and speaking.
The acrylic base of a plastic denture is custom-shaped to match the exact contours of a patient's gum ridges at the time of fabrication. However, because bone resorption is an ongoing biological process following tooth loss, the fit that was accurate at the time of manufacture gradually becomes less precise.
This mismatch between the denture base and the changing gum tissue is the primary clinical reason why dentures eventually become loose. The tongue — particularly active during speech — exploits this instability, causing the denture to move. The clicking sound is the audible consequence of that movement.
In some cases, a denture reline procedure can be carried out, in which the inner surface of the denture base is re-fitted to the current shape of the gum ridge, restoring a closer and more stable fit without the need to replace the entire denture.
When to Seek a Professional Dental Assessment
Occasional mild clicking in a new denture is generally part of the adjustment process. However, there are situations where a professional dental review is advisable:
- Persistent clicking that does not improve after several weeks of wearing a new denture
- Clicking that has developed in a previously comfortable denture, which may indicate bone changes beneath the denture base
- Soreness or ulceration of the gum tissue beneath the denture, which can result from uneven pressure caused by a poorly fitting appliance
- Difficulty eating or chewing, which suggests the denture is not providing adequate stability for function
- Noticeably increased looseness when compared to how the denture felt previously
- Any discomfort around the jaw joints associated with wearing the denture
It is also worth noting that poorly fitting dentures can, over time, accelerate bone resorption in the jaw. Seeking a review promptly — rather than tolerating the issue — is in the patient's long-term interest.
Dental symptoms and treatment options should always be assessed individually during a clinical examination.
Prevention and Practical Oral Health Advice
While some degree of fit change over time is unavoidable, there are practical steps denture wearers can take to maintain comfort and minimise complications:
- Attend regular denture review appointments. Most dental practitioners recommend a check-up at least once a year, even for patients without natural teeth. This allows the fit, condition of the denture, and the health of the underlying gum tissue and bone to be monitored.
- Clean your dentures thoroughly each day. Use a soft denture brush and non-abrasive denture cleaning products. Avoid toothpaste, which can scratch the acrylic surface.
- Soak dentures overnight in a denture-cleaning solution or plain cold water to maintain their shape and hygiene.
- Avoid using household adhesives or attempting to adjust or repair a denture at home. This risks damaging the appliance and potentially harming the soft tissues in the mouth.
- Use denture adhesive appropriately if recommended by your dentist, bearing in mind that it is a temporary measure and not a substitute for a properly fitting denture.
- Report changes in fit promptly. If your denture begins to feel noticeably looser, or if clicking becomes persistent, raise this at your next appointment rather than waiting.
Understanding the importance of maintaining oral health with dentures can help patients develop a routine that supports long-term comfort and tissue health.
Key Points to Remember
- Clicking sounds from plastic dentures during speech — especially on "S" sounds — are most commonly caused by a loose or ill-fitting denture.
- Bone resorption after tooth loss is a natural process that gradually changes the shape of the gum ridges, affecting denture fit over time.
- New denture wearers should expect an adjustment period of several weeks; persistent clicking beyond this warrants a professional review.
- A denture reline or replacement may restore stability and reduce or resolve the clicking sound.
- Regular dental check-ups are important for all denture wearers, even in the absence of natural teeth.
- Never attempt to adjust or repair a denture at home — always consult a qualified dental professional.
Frequently Asked Questions (FAQs)
Is it normal for new dentures to click when talking?
Yes, some degree of clicking or speech difficulty is common in the first few weeks of wearing new dentures. The tongue and lips need time to adjust to the new structure in the mouth. Practising speaking aloud — reading a book or talking slowly — can help. However, if clicking persists beyond four to six weeks, or if the denture feels noticeably loose, it is advisable to arrange a review with your dental professional to assess the fit.
Can denture adhesive stop the clicking sound?
Denture adhesive can temporarily improve retention and may reduce clicking in some cases. However, it is important to understand that adhesive is not a long-term solution for a poorly fitting denture. If you find yourself relying heavily on adhesive to keep your denture stable, this is a sign that the denture may need relining or replacing. A dental professional can assess whether adhesive is appropriate in your individual case.
How often should plastic dentures be replaced?
As a general guideline, plastic dentures typically last between five and ten years, though this varies depending on the material, how well they are maintained, and how much the underlying bone structure changes over time. Regular professional reviews can help determine when a reline, adjustment, or new set of dentures may be appropriate. Your dentist is best placed to advise based on a clinical examination of your individual situation.
Why do lower dentures click more than upper dentures?
Lower dentures generally have less surface area in contact with the gum tissue and lack the palatal suction that helps upper dentures stay in place. They are also subjected to considerable movement from the tongue. This makes them inherently less stable, which is why clicking and looseness tend to be reported more frequently with lower dentures. Options such as implant-retained dentures may be worth discussing with a dental professional if lower denture instability is significantly affecting quality of life.
Can clicking dentures damage my gums?
A denture that moves excessively can create uneven pressure on the gum tissue and underlying bone. Over time, this may cause soreness, ulceration, or accelerated bone loss in the jaw ridges. If you notice persistent tenderness, redness, or sore spots beneath your denture, it is sensible to seek a professional review. Early attention to fit issues can help protect the long-term health of the oral tissues. You can learn more about gum and soft tissue health on our dental care pages.
Are there alternatives to plastic dentures that might be more stable?
Yes. For patients who experience persistent difficulty with conventional plastic dentures, there are alternative options that a dental professional may discuss during a clinical assessment. Implant-retained dentures, for example, use dental implants to provide a secure anchor point, significantly improving stability during eating and speaking. Whether such options are suitable depends entirely on individual clinical factors, including bone density and general health. Treatment suitability must always be determined through a thorough professional examination.
Conclusion
A clicking sound from plastic dentures during speech — particularly on words containing "S" — is a common and understandable concern for many denture wearers. As this article has explained, the sound is most often the result of a denture that has become loose due to natural changes in the jaw bone and gum tissue over time.
Understanding the underlying cause — the gradual resorption of bone following tooth loss and the resulting loss of denture fit — can help patients make sense of what they are experiencing and feel more confident about seeking appropriate advice. While the adjustment period for new dentures may involve some initial clicking, persistent or worsening clicking in an established denture is a reasonable reason to arrange a dental review.
Regular professional check-ups, proper denture hygiene, and prompt reporting of any changes in fit are all important aspects of responsible denture care. Dental symptoms and treatment options should always be assessed individually during a clinical examination.
If you are concerned about the fit or performance of your dentures, seeking a professional assessment is always a sensible and positive step.
Disclaimer: This article is intended for general educational purposes only and does not constitute personalised dental or medical advice. Individual diagnosis and treatment recommendations require a clinical examination by a qualified professional.
Next Review Due: 14 September 2027
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