Dentures can stay in water overnight, but not indefinitely
Dentures should be soaked in water or denture solution every night, and they can safely remain submerged for 8 to 24 hours. Most denture wearers soak them overnight — typically 6 to 8 hours — which is the standard practice recommended by dentists. Leaving dentures in water longer than 24 hours can cause them to warp, crack, or lose their shape, especially if the water is too hot or the dentures are old.
The goal of soaking is to keep the denture material from drying out and becoming brittle. Dentures are made of acrylic resin, a plastic that shrinks and hardens when exposed to air for extended periods. Water prevents this damage, but water alone is not enough — the type of liquid you use matters just as much as how long you soak.
Key Takeaways
- Soak dentures in water or denture solution for 6 to 8 hours each night, which is the standard overnight routine.
- Never leave dentures in water longer than 24 hours, as extended soaking can warp or crack the acrylic material.
- Use room-temperature water or a denture-specific solution, never hot water, which can permanently distort the dentures.
- If you must store dentures for more than a day, change the soaking liquid daily and keep them in a cool, moist environment.
- Dentures left to dry out for even a few hours can shrink and no longer fit properly when you put them back in.
Why dentures need to stay moist
Denture material is porous and absorbs moisture from your mouth while you wear them. When you remove them, that moisture begins to evaporate, and the acrylic starts to shrink. This shrinkage is permanent — once a denture dries out, soaking it again will not restore its original size or fit.
A denture that has dried and shrunk will feel loose or uncomfortable when you put it back in. In some cases, a shrunken denture can slip during eating or speaking, or it may no longer seal properly against your gums. This is why dentists recommend soaking dentures every single night, without exception.
Water versus denture solution — what makes the difference
Plain tap water works in a pinch, but denture-specific solutions are designed to do more than just keep dentures moist. Commercial denture solutions contain mild cleaners and sometimes antimicrobial agents that reduce bacteria and fungal growth on the denture surface. They also help remove stains and odors that plain water cannot.
If you use plain water, change it at least once daily, especially if you are soaking for longer than 12 hours. Stagnant water can develop bacteria and become cloudy. Denture solutions are formulated to stay effective longer, so you can use the same solution for the full soak period without changing it.
Never use hot water, boiling water, or mouthwash to soak dentures. Hot water can warp the acrylic permanently, and mouthwash can damage the denture material or discolor it. Room-temperature water or solution is always the safest choice.
What happens if you leave dentures in water too long
Soaking dentures for 24 to 48 hours occasionally will not cause when ready damage, but it increases the risk of warping, especially if the water is warm or if the dentures are already older and more fragile. Extended soaking can also soften the acrylic slightly, making it more prone to cracking or breaking if you handle them roughly.
If dentures are left in water for several days, the acrylic can absorb too much moisture and become swollen or misshapen. The denture base may no longer fit your mouth properly, and you may need to see your dentist for adjustments or a reline. In some cases, prolonged soaking can cause permanent damage that requires replacement.
Storing dentures for a few days or longer
If you need to store dentures for more than one day — for example, during a hospital stay or while traveling — keep them in a sealed container with fresh denture solution or room-temperature water. Change the liquid daily to prevent bacterial growth and cloudiness.
Do not store dentures in a dry case or wrapped in tissue, even for a few hours. The acrylic will begin to shrink within hours of drying out. If you are traveling and do not have access to denture solution, plain water in a small sealed container is better than letting them dry.
When you return to your normal routine, soak the dentures in fresh solution for at least 30 minutes before wearing them again. This allows them to rehydrate fully and regain their proper shape and fit.
Daily cleaning while soaking
Soaking is not the same as cleaning. While dentures soak overnight, they are not being brushed or scrubbed. In the morning, remove them from the solution and brush them gently with a soft-bristled denture brush and mild soap or denture cleanser. This removes plaque, food particles, and any buildup that accumulated overnight.
Some denture wearers use a denture tablet — a fizzy tablet you drop into water — to help loosen debris while soaking. These tablets are safe to use and can make the morning cleaning easier. However, tablets alone do not replace brushing, so always brush your dentures after soaking.
Signs your dentures may have been damaged by water exposure
If you notice your dentures feel loose or shift when you eat or talk, they may have warped from improper storage or extended soaking. A denture that no longer fits snugly against your gums can also cause sore spots or irritation. These are signs to contact your dentist.
Visible cracks, discoloration, or a chalky appearance on the denture surface can also indicate water damage or prolonged exposure to unsuitable liquids. Your dentist can assess whether the dentures can be repaired or adjusted, or whether replacement is necessary.
Frequently Asked Questions
Can I leave dentures in water while I sleep?
Yes, soaking dentures overnight is the standard practice. Most people soak them for 6 to 8 hours while they sleep. This keeps the acrylic moist and prevents shrinkage. Just make sure to use room-temperature water or denture solution, not hot water.
What if I forget to soak my dentures one night?
If you forget one night, soak them as soon as you remember. If they have dried out and feel stiff or uncomfortable, soak them for at least 30 minutes before wearing them again. Occasional missed soakings are not ideal but will not cause permanent damage if you resume the routine right away.
Is it safe to soak dentures in mouthwash?
No. Mouthwash can damage the acrylic material, cause discoloration, and is not formulated for extended soaking. Stick to plain water or a denture-specific solution. If you want to freshen your dentures, rinse them with mouthwash briefly, then soak them in water or solution.
Can I soak dentures in salt water?
Salt water is not recommended for regular soaking. While a brief salt water rinse may help with minor odors, salt can be abrasive and may damage the denture surface over time. Denture solution or plain water is safer and more effective for overnight soaking.
What should I do if my dentures crack while soaking?
Remove them from the water when ready and let them air dry gently. Do not try to repair them yourself. Contact your dentist as soon as possible. Small cracks can sometimes be repaired, but larger ones may require replacement. In the meantime, wear your dentures only if they are comfortable and do not have sharp edges.