Most dentures need to be relined every two years. Some people can go three years or longer between relines, but the majority need them on a roughly two-year cycle because the jawbone underneath the denture gradually changes shape after teeth are removed. A reline reshapes the inside surface of the denture so it matches your current gum and bone contours, restoring a snug fit.
Why Dentures Stop Fitting Over Time
Once teeth are removed, the bone that once held them in place begins to shrink. The jaw ridge can lose up to 50% of its width in the first year after extraction, with about two-thirds of that loss happening in the first three months alone. After that initial period, the bone continues to resorb at a slower but steady pace for the rest of your life.
This means the tissue surface your denture was originally molded against is always changing. Even a denture that fit perfectly on day one will gradually develop gaps between the acrylic base and your gums. Those gaps allow the denture to shift during chewing and speaking, which creates friction, sore spots, and eventually tissue damage. Relining fills in those gaps with new material so the denture conforms to your current anatomy.
Hard Reline vs. Soft Reline
A hard reline uses rigid acrylic resin to resurface the inside of your denture. This is the standard, long-lasting option. A well-done hard reline typically holds up for two years or more, and for some wearers it can last three years before another adjustment is needed.
A soft reline uses a pliable, cushion-like material instead. It’s designed for people with chronically sore or thin gum tissue who can’t tolerate a hard surface pressing against their ridges. The trade-off is durability: soft reline materials generally last only three to six months before they need to be replaced. They’re sometimes used as a temporary measure while healing from oral surgery or while waiting for a new set of dentures to be fabricated.
Chairside vs. Laboratory Relines
There are two ways to perform a hard reline, and the difference comes down to where the work happens.
A chairside (direct) reline is done in the dental office while you wait. Your dentist applies a self-curing resin directly inside the denture, seats it in your mouth, and lets it set. The material can fully cure in about 10 minutes, so you walk out the same day with a relined denture. Chairside relines are convenient and, interestingly, research shows they can be more dimensionally accurate than lab-processed versions, meaning less shrinkage and a truer fit to your tissue.
A laboratory (indirect) reline involves your dentist taking an impression inside the denture, then sending it to a dental lab where technicians strip and replace the inner surface using heat-cured acrylic. The lab process produces a denser, stronger base material with less residual chemical content. The downside is you’ll be without your denture for up to a day while the lab completes the work. Heat-cured materials are stiffer and more durable over time, but they do shrink slightly more during processing than chairside resins.
Signs Your Dentures Need Relining
You don’t have to wait for the two-year mark if your dentures are already telling you something is off. The most common signs include:
- Looseness or rocking when you chew, talk, or yawn
- Sore spots or ulcers on the gum tissue under the denture
- Food getting trapped between the denture and your gums more than it used to
- Cracked or irritated skin at the corners of your mouth (angular cheilitis), which can develop when a worn denture allows the jaw to close too far
- Increased reliance on denture adhesive to keep things in place
The American Dental Association specifically notes that denture adhesive is not a substitute for a proper fit. If you’re using more adhesive than you used to, or if your denture feels comfortable only with adhesive, that’s a signal the base no longer matches your tissue. Continuing to wear an ill-fitting denture without correction can lead to chronic tissue inflammation and overgrowth of irritated gum tissue that may eventually require surgical removal.
Reline vs. Rebase vs. Replacement
A reline only adds new material to the tissue-facing surface of your existing denture base. It’s the right fix when the denture teeth are still in good shape and the acrylic framework is sound, but the fit has loosened.
A rebase is more extensive. It replaces the entire acrylic base while keeping the original teeth. This is recommended when the base material itself has deteriorated, cracked in multiple places, or warped, but the teeth still look and function well. A rebase essentially gives you a new denture body with your old teeth reattached.
Full replacement is typically needed every five to eight years, or sooner if the teeth are visibly worn down, chipped, or discolored beyond what a reline or rebase can address. Your dentist can help you determine which option makes sense based on the condition of both the base and the teeth.
What a Reline Costs
Reline costs vary by region and dental office, but general ranges give you a useful starting point. Chairside relines tend to be the least expensive option. For reference, 2025 Medicaid reimbursement rates in Connecticut set direct (chairside) relines at about $72 per denture and indirect (laboratory) relines at roughly $125 to $130. Private practice fees are typically higher than Medicaid rates, so expect to pay somewhere in the range of $150 to $400 for a chairside reline and $300 to $500 for a lab-processed reline at a private office, depending on your location.
Many dental insurance plans cover relines, though most limit coverage to one reline per denture every 12 to 24 months. Check your specific plan, because some require a waiting period after the denture is first placed before they’ll cover a reline.
Lower Dentures Usually Need It Sooner
If you wear both an upper and lower denture, the lower one will almost always need relining more frequently. The lower jaw loses bone faster than the upper jaw after tooth removal, and the lower denture sits on a narrower, more mobile ridge. It also has to compete with your tongue for space. Upper dentures benefit from suction against the palate, which helps compensate for minor fit changes. Lower dentures have no such advantage, so even small amounts of bone loss translate directly into looseness.
This is why many lower denture wearers find themselves needing a reline closer to every 12 to 18 months, while the upper may comfortably go the full two years or beyond.