Cavity fillings are one of the most common dental treatments, helping to restore teeth damaged by decay and preventing further problems. Their longevity, however, isn’t the same for everyone. How long a filling lasts depends on several factors, including the type of material used, where the filling is located in your mouth, and your daily oral care habits.
On average, cavity fillings last between 5 and 15 years, though some can last even longer with proper maintenance and regular dental check-ups.
What is a Cavity Filling?
A cavity filling is a dental restoration used to repair a tooth damaged by decay. When bacteria create a hole (cavity) in your tooth, your dentist removes the decayed portion and fills the empty space with a restorative material.
Without treatment, cavities continue to grow larger and deeper, potentially leading to:
- Severe tooth discomfort
- Infection
- Tooth loss
- A need for more extensive procedures like root canals or crowns
Common signs you might need a filling include:
- Toothache or persistent discomfort
- Sensitivity to hot, cold, or sweet foods
- Visible holes or dark spots on teeth
- Sharp edges or rough surfaces on teeth
Types of Dental Filling Materials & Their Lifespans
The type of dental filling material your dentist uses impacts how long your filling will last. Each material has different advantages and expected lifespans.
Composite Resin Fillings
Composite fillings are tooth-coloured and blend seamlessly with your natural teeth. They’re popular for visible areas but typically last 5-10 years. While they provide excellent aesthetics, they may wear down faster than other materials, especially in areas that experience heavy chewing pressure.
Amalgam Fillings
Made from a mixture of metals including silver, tin, and mercury, amalgam fillings are incredibly durable and often last 10-15 years or longer. They’re particularly effective for back teeth where strength is more important than appearance.
Gold Fillings
Gold fillings are the most durable option, potentially lasting 15-30 years. They’re biocompatible and resist wear exceptionally well. However, they’re also the most expensive option and require multiple appointments to place.
Ceramic Fillings
Porcelain or ceramic fillings offer excellent durability and aesthetics, typically lasting 10-15 years. They resist staining and wear well, making them an excellent choice for visible teeth.
Glass Ionomer Fillings
These fillings release fluoride to help prevent future decay and are often used in children’s dentistry or areas below the gum line. They typically last 5-7 years and are less durable than other options.
Factors That Affect Cavity Filling Lifespan
Several factors influence how long your filling will last, many of which you can control through your daily habits and choices.
Location & Size of the Filling
Fillings in back teeth (molars) experience more pressure from chewing and grinding, which can reduce their lifespan. Large fillings are also more susceptible to breaking down than smaller ones, as they replace more of the tooth’s natural structure.
Your Oral Hygiene Routine
Oral hygiene is important for extending the lifespan of your fillings. Poor hygiene allows bacteria to accumulate around the filling’s edges, leading to new decay that can compromise your restoration. Brushing twice daily with fluoride toothpaste and flossing regularly helps prevent this issue.
Teeth Grinding & Clenching
Bruxism (teeth grinding or clenching) puts excessive pressure on fillings, causing them to crack, chip, or wear down prematurely. Many people grind their teeth at night without realizing it, which can significantly shorten filling lifespan.
Diet & Eating Habits
Your food choices directly impact your filling’s longevity. Hard foods like ice, nuts, or hard candy can crack fillings, while sticky foods like caramel can pull them loose. Acidic foods and drinks can also weaken the bond between the filling and your tooth.
Regular Dental Care
Routine dental visits allow your dentist to monitor your fillings and catch problems early. Professional cleanings remove plaque and tartar that can lead to decay around fillings, while regular examinations help identify wear or damage before it becomes serious.
Warning Signs Your Filling Needs Replacement
Even well-maintained fillings eventually need replacement. Watch for these signs that indicate it’s time for a new filling:
- Discomfort or sensitivity: If you experience discomfort when eating or drinking, especially with temperature changes, your filling may be failing.
- Visible damage: Cracks, chips, or discolouration in your filling indicate it’s no longer protecting your tooth effectively.
- Rough or sharp edges: A filling that feels jagged or rough suggests it’s breaking down and may harbor bacteria.
- Food trapping: If food consistently gets stuck around a filling, there may be gaps where bacteria can enter and cause decay.
- Persistent bad breath: A damaged filling can trap bacteria, leading to chronic bad breath or an unpleasant taste.
If you notice any of these symptoms, don’t wait—contact your dentist promptly to prevent more serious complications.
Risks of Delaying Filling Replacement
Ignoring a failing filling can lead to serious consequences that require more extensive and expensive treatments:
- Secondary decay: Bacteria can penetrate beneath a damaged filling, causing new cavities that may be larger than the original
- Tooth fractures: A compromised filling weakens the tooth structure, increasing the risk of cracks or breaks
- Infection: If decay reaches the tooth’s pulp, you may need a root canal or face tooth loss
- Increased treatment costs: What could be a simple filling replacement may become a complex restoration
Protecting Your Smile With Quality Dental Care
The lifespan of a cavity filling typically ranges from 5 to 15 years, depending on the material used and your daily care habits. With proper maintenance and regular dental check-ups, you can help your fillings last longer and keep your smile healthy. At Hometown Dental, we’re here to provide the care and guidance you need to protect your dental work and overall oral health. Book your next appointment with us today and take the next step toward a stronger, healthier smile.
