Dental fillings are designed to repair cavities and protect damaged teeth, but they don’t necessarily last forever. Years of chewing, grinding, temperature changes, and everyday wear can eventually cause a filling to loosen, crack, or stop sealing the tooth properly.
The problem is that a failing filling isn’t always obvious. You may notice sensitivity or discomfort, but in some cases, decay can develop underneath an older restoration without causing symptoms at first.
At Lakeridge Dental in Brampton, we use tooth-coloured bonded fillings to restore damaged teeth while maintaining a natural appearance. We also regularly examine existing dental work to identify fillings that may need repair or replacement.
Here are six signs that your dental filling could be failing and what you should do next.
1. Your Tooth Has Become Sensitive
New or increasing sensitivity is one of the most common warning signs that something may be happening around a filling.
You might notice sensitivity when consuming:
- Cold drinks
- Hot foods
- Sweets
- Acidic foods
- Cold air
A brief sensation doesn’t necessarily mean your filling has failed. However, sensitivity that appears suddenly, becomes stronger, or lingers after the trigger is gone should be evaluated.
A small opening between the filling and tooth can allow bacteria and liquids to reach more sensitive areas underneath.
2. You Feel Pain When Biting Down
Does one particular tooth hurt when you chew?
Pain when biting can sometimes indicate that a filling is cracked, loose, or no longer supporting the tooth correctly. It may also mean the tooth itself has developed a crack.
Your dentist can examine the filling and take digital X-rays when necessary to determine what’s causing the discomfort.
Depending on the extent of the damage, the tooth may simply need a replacement filling. If a significant amount of tooth structure has been lost, a crown or another restoration may provide better protection.
3. Your Filling Feels Loose
A filling should feel like a natural part of your tooth.
If you can feel movement when biting or notice that the filling suddenly feels different with your tongue, schedule a dental appointment.
A loose filling creates small spaces where bacteria and food particles can collect. Because these areas are difficult to clean with brushing and flossing, new decay can develop underneath the restoration.
Avoid chewing hard foods on that side of your mouth until the tooth has been examined.
4. Part of the Filling Has Broken or Fallen Out
Sometimes the signs of filling failure are obvious.
You may notice a piece of material in your mouth after eating, or suddenly feel a hole or sharp edge in your tooth.
A broken or missing filling leaves the underlying tooth exposed and potentially vulnerable to sensitivity, bacteria, and further fracture.
If your filling falls out, contact your dentist as soon as possible. Don’t assume that the absence of pain means the tooth is safe.
A new bonded filling may be all that’s required if enough healthy tooth structure remains.
5. You Notice a Crack or Dark Area Around the Filling
Take a closer look at your teeth occasionally when brushing.
A visible crack, chipped edge, or dark line around a filling can indicate deterioration of either the restoration or the surrounding tooth.
Discolouration doesn’t automatically mean there is decay. Some older restorations naturally change appearance over time. However, darkening around the edge of a filling should be assessed because bacteria may have entered underneath it.
Regular dental examinations and professional cleanings allow your dentist to monitor older restorations and detect these changes early.
6. You Have a Persistent Toothache
A persistent toothache should never be ignored.
If bacteria have entered beneath a damaged filling, decay can progress deeper into the tooth. Once it reaches the dental pulp, where the nerves and blood vessels are located, the tooth can become inflamed or infected.
Symptoms may include:
- Throbbing pain
- Lingering sensitivity
- Pain that wakes you at night
- Swelling around the tooth
- Pain when chewing
If the pulp becomes infected, replacing the filling alone may no longer solve the problem. Root canal therapy may be needed to remove the infection and preserve the natural tooth.
This is one reason early treatment is so important.
Why Do Dental Fillings Fail?
Even a well-placed filling experiences considerable pressure over its lifetime.
Fillings may eventually fail because of normal wear, teeth grinding, biting hard foods or objects, new decay around the restoration, or cracks developing in the surrounding tooth.
Large fillings can be particularly vulnerable because less natural tooth structure remains around them.
Your oral hygiene also matters. Plaque can accumulate where the filling meets the natural tooth, potentially allowing a new cavity to form around or underneath the restoration.
What Happens When a Filling Needs to Be Replaced?
Treatment depends on what your dentist finds.
If the problem is limited to the filling and the remaining tooth is healthy, the old restoration can usually be removed and replaced with a new tooth-coloured filling.
If the tooth has become significantly weakened, a dental crown may be recommended to provide greater coverage and protection.
When decay has reached the nerve, root canal treatment may be necessary before the tooth is restored.
In severe cases where a tooth cannot be predictably saved, removal may be necessary. Missing teeth can then be restored using options such as dental implants or dental bridges.
The earlier a failing filling is identified, the more likely it is that treatment will remain straightforward.
How Can You Make Dental Fillings Last Longer?
Good everyday habits can help extend the lifespan of your restorations.
Brush twice daily, floss every day, and attend regular dental examinations. Avoid chewing ice, pens, or other hard objects that can damage both fillings and natural teeth.
If you grind or clench your teeth, mention it to your dentist. Repeated grinding can place substantial pressure on restorations and increase the risk of cracks and fractures.
Most importantly, don’t wait for a filling to hurt before having it checked. Routine examinations allow your dentist to monitor your existing dental work and address small problems before they become larger ones.
Have Your Dental Filling Checked at Lakeridge Dental
If a filling feels loose, your tooth has suddenly become sensitive, or you’re experiencing pain when chewing, it’s a good idea to have the area examined rather than waiting for the problem to worsen. At Lakeridge Dental in Brampton, we can assess your existing restoration, determine whether there is decay or damage underneath it, and explain whether a new filling or another treatment is appropriate. Call Lakeridge Dental at 905-451-8600 to schedule an appointment and let our team help you protect your natural teeth and existing dental work.
Frequently Asked Questions
How long do dental fillings usually last?
The lifespan of a filling varies depending on the material, size and location of the restoration, your oral hygiene, and habits such as grinding. Regular dental examinations help determine when an older filling needs attention.
Can a dentist repair a filling instead of replacing it?
Sometimes. Minor damage may be repairable, but a loose, extensively cracked, or decayed restoration may need to be completely replaced. Your dentist will assess the tooth before recommending treatment.
Is a loose filling a dental emergency?
A loose filling isn’t always an immediate emergency, but it should be examined promptly. If you have severe pain, swelling, or signs of infection, seek urgent dental care.
Can decay develop underneath a filling?
Yes. Bacteria can enter around the edges of an older or damaged filling and cause recurrent decay underneath it. This may not cause noticeable symptoms during the early stages.
What happens if I ignore a failing filling?
The filling may break further, additional decay can develop, or the tooth itself may fracture. In some cases, a problem that initially requires only a replacement filling can progress until root canal therapy or more extensive treatment is necessary.
