Dental fillings for cavity treatment involve removing the decayed part of a tooth and filling the space with a strong, tooth-colored material to restore its shape and function. Fillings are one of the most common dental procedures performed in the United States, and they remain the go-to solution for small to medium-sized cavities. According to the National Institute of Dental and Craniofacial Research (NIDCR), tooth decay is the most common chronic disease in both children and adults. This article covers how fillings work, the types of filling materials available, what to expect during the procedure, how long fillings last, and how to keep your teeth healthy after treatment.
How Dental Fillings Treat Cavities
A dental filling works by sealing off the area where bacteria have eaten through tooth enamel and created a hole. Once the decay is removed, the filling material bonds to the remaining tooth structure and prevents bacteria from getting back in. Without treatment, a cavity will continue to grow deeper into the tooth.
The CDC’s 2024 Oral Health Surveillance Report found that approximately 91% of adults aged 20 to 64 have experienced dental caries in their permanent teeth. That number jumps to 94% to 97% among adults aged 35 to 64. These numbers show just how common cavities are and why fillings play such a critical role in everyday dental care.
Patients throughout Flushing, Bayside, and the surrounding Queens neighborhoods often come to us with small cavities that were caught during a routine dental exam. Catching decay early means a simple filling is usually all that is needed to fix the problem.
Types of Dental Filling Materials
There are several types of materials used to fill cavities. Each one has different strengths, and the right choice depends on the size and location of the cavity.
Composite resin is the most popular filling material used today. It is made from a blend of plastic and fine glass particles, and it matches the natural color of your teeth. Composite fillings bond directly to the tooth and can last 7 to 10 years with proper care. According to a study published in the Journal of Dentistry, posterior composite fillings have an annual failure rate of only 1% to 3%, meaning the vast majority hold up well over time.
Amalgam fillings, sometimes called silver fillings, are made from a mix of metals including silver, tin, and copper, along with mercury. They have been used for over 150 years and are very durable, lasting 10 to 15 years on average. However, a study published in the Journal of the American Dental Association (JADA) in 2024 confirmed a steady decline in amalgam use from 2017 through 2023. The ADA now supports a phasedown approach to amalgam, consistent with the Minamata Convention on Mercury.
If you have an older filling that needs to be replaced, our team at our Flushing office on Northern Blvd can walk you through all your options during a general dentistry visit.
Ceramic fillings are made from porcelain and can last 15 years or longer, according to the American Dental Association. They resist staining better than composite but are typically used for larger restorations like inlays or onlays.
Glass ionomer fillings are made from a mix of glass and acrylic. They are weaker than other materials and are most often used for small cavities near the gum line or in baby teeth. One advantage is that they release fluoride, which can help protect the tooth from further decay.
What Happens During a Cavity Filling Procedure
Getting a filling is a quick and straightforward process. Most fillings take between 20 and 60 minutes from start to finish, depending on the size and location of the cavity. Here is what to expect step by step.
First, we numb the area around the tooth with a local anesthetic. This takes about 10 to 15 minutes to take full effect. Once you are comfortable, we use a small dental drill or laser to remove the decayed portion of the tooth. This step usually takes 5 to 20 minutes depending on how deep the decay goes.
After the decay is removed, we clean and dry the inside of the cavity. For composite fillings, the resin is applied in thin layers and hardened with a special curing light. Each layer bonds to the one beneath it, creating a strong seal. Once the filling is built up, we shape and polish it so your bite feels natural.
Families in Fresh Meadows, Whitestone, and Kew Gardens who need a filling can schedule an appointment at our Flushing location for a comfortable, efficient visit.
Patients near Bayside who have been putting off a dental visit often find that the filling process is far simpler than they expected.
Patients who are worried about early signs of cavities should know that the sooner a cavity is caught, the smaller the filling and the quicker the visit.
How Long Do Dental Fillings Last
How long dental fillings last depends on the material, the size of the filling, where it is located in the mouth, and your daily habits. On average, composite fillings last 7 to 10 years. Amalgam fillings tend to last 10 to 15 years. Gold fillings can last 20 years or more according to the ADA, and ceramic fillings often last 15 years or longer.
A Georgetown University study found that after five years, approximately 92% of composite restorations were still functional and intact. That is a strong track record, especially for a material that blends in with your natural teeth.
Several factors can shorten the lifespan of a filling. Grinding your teeth at night, eating a lot of hard or sticky foods, and poor oral hygiene all put extra stress on fillings. If we notice signs of grinding during your exam, we may recommend a night guard to protect both your teeth and your fillings.
Patients in the Long Island area who want to know if an older filling needs to be replaced can visit our office for a comprehensive evaluation.
Composite Fillings vs. Amalgam Fillings
The choice between composite and amalgam is one of the most common questions patients ask. Both materials work well, but they serve different needs. Here is a side-by-side comparison.
| Feature | Composite Resin | Amalgam (Silver) |
| Appearance | Tooth-colored, blends in | Silver/metallic, visible |
| Average Lifespan | 7 to 10 years | 10 to 15 years |
| Bonding | Bonds directly to tooth | Held in place mechanically |
| Tooth Preservation | Less tooth removal needed | More tooth removal needed |
| Mercury Content | Mercury-free | Contains approximately 50% mercury |
| Best For | Small to medium cavities, visible teeth | Large cavities on back teeth |
| Trend | Increasing in use | Declining since 2017 (JADA 2024) |
Sources: American Dental Association (ADA), Journal of the American Dental Association (JADA) 2024, Minamata Convention on Mercury
We use composite resin fillings in our Flushing practice because they preserve more of your natural tooth structure and look completely natural. You can read more about the differences in our blog on composite fillings vs. amalgam.
For patients who want to go beyond fillings and improve the overall look of their smile, cosmetic dentistry options like bonding and veneers can address chips, stains, and uneven teeth.
Why Treating Cavities Early Matters
A cavity that goes untreated will not stop growing on its own. Over time, the decay reaches the inner pulp of the tooth, where the nerves and blood vessels are. At that point, a simple filling is no longer enough, and a root canal or extraction may be the only option left.
In some cases, an untreated cavity can lead to sudden, severe pain that requires emergency dental care to get under control.
The CDC reports that nearly 21% of adults aged 20 to 64 have at least one tooth with untreated decay. Among certain populations, that number is even higher, reaching 42% among non-Hispanic Black adults and 36% among Hispanic adults. These numbers point to a real gap in access to basic dental care.
Patients in Murray Hill, Auburndale, and Little Neck who have been putting off a dental visit should know that a professional dental cleaning paired with an exam can catch cavities before they become painful or expensive to treat.
If decay does reach the nerve of the tooth, a root canal may be necessary to save the tooth and stop the infection from spreading.
How to Care for Your Teeth After Getting a Filling
After getting a filling, most patients can eat and drink normally once the numbness wears off, which usually takes one to three hours. Composite fillings harden immediately under the curing light, so there is no waiting period.
Some sensitivity to hot, cold, or pressure is normal for the first few days after a filling. This usually goes away on its own. If sensitivity lasts more than two weeks, contact your dentist for a follow-up.
To make your fillings last as long as possible, follow these habits. Brush twice a day with fluoride toothpaste. Floss every day to remove plaque from between your teeth. Avoid chewing on hard objects like ice or pen caps. Visit your dentist every six months for a checkup and cleaning. The ADA recommends these twice-yearly visits as the foundation of good oral health.
According to the World Health Organization, untreated dental caries affects an estimated 2.5 billion people worldwide. Good daily habits and regular dental visits are the most effective way to avoid becoming part of that statistic.
Residents across Queens and the broader New York metro area looking for a dentist in Queens can schedule a preventive visit to keep their teeth in strong shape.
Patients near Fresh Meadows who want to stay on top of their oral health will benefit from keeping up with twice-yearly visits.
Frequently Asked Questions
How Long Do Cavity Fillings Usually Last?
Cavity fillings usually last between 7 and 15 years depending on the material. Composite resin fillings last an average of 7 to 10 years, while amalgam fillings can last 10 to 15 years. According to the ADA, gold fillings may last 20 years or more. The lifespan of any filling depends on your oral hygiene, diet, and whether you grind your teeth.
Why Don’t Dentists Use Metal Fillings Anymore?
Dentists have moved away from metal (amalgam) fillings for several reasons. Composite resin fillings look more natural, bond directly to the tooth, and require less removal of healthy tooth structure. A 2024 study published in JADA confirmed a steady decline in amalgam restorations from 2017 through 2023. The global Minamata Convention on Mercury has also encouraged a phasedown of dental amalgam use, and the ADA supports this approach.
What Do Dentists Put on Teeth to Stop Cavities?
Dentists put several things on teeth to stop cavities from forming or getting worse. Fluoride varnish strengthens weakened enamel and can reverse very early-stage decay. Dental sealants are thin plastic coatings applied to the chewing surfaces of back teeth to block bacteria. According to the CDC, sealants can prevent about 80% of cavities in the back teeth where most decay occurs. For cavities that have already formed, a filling is placed to remove the decay and seal the tooth.
Is It Worth Replacing Old Fillings?
Replacing old fillings is worth it when the filling is cracked, worn down, or has decay forming around its edges. A filling that no longer seals properly allows bacteria to get underneath and cause new decay. Your dentist can check the condition of your fillings during a routine exam using visual inspection and X-rays. If a filling is still intact and the tooth around it is healthy, there is no need to replace it.
Do Teeth Rot Under Fillings?
Teeth can develop new decay under fillings if the seal between the filling and the tooth breaks down over time. This is called secondary or recurrent caries. According to research published in the Journal of Dental Research, secondary caries is one of the most common reasons fillings need to be replaced. Good oral hygiene and regular dental visits help catch this early before the decay spreads deeper into the tooth.
Is 4 Fillings at Once a Lot?
Getting 4 fillings at once is not unusual, and many dentists will treat multiple cavities in the same visit if they are small and located in the same area of the mouth. The NIDCR reports that nearly 90% of adults have had at least one cavity, and many have several throughout their lifetime. Treating multiple small fillings in one appointment saves time and reduces the number of visits. If the cavities are spread across different areas of the mouth, your dentist may split the work into two visits for your comfort.
Will an MRI Pull Out Dental Fillings?
An MRI will not pull out dental fillings. Composite resin and ceramic fillings contain no metal at all and are completely safe in an MRI machine. Amalgam fillings do contain metal, but they are not magnetic enough to be affected by the MRI’s magnetic field. The American College of Radiology confirms that dental amalgam fillings are considered safe during MRI scans. You should always let your radiologist know about any dental work before the scan, but fillings are not a reason to skip an MRI.
Taking the Next Step
Cavities are extremely common, but they are also one of the easiest dental problems to fix when caught early. A simple filling can protect your tooth for years, prevent further decay, and save you from more involved procedures down the road.
If it has been a while since your last dental visit, or if you have noticed any tooth sensitivity or discomfort, now is a good time to schedule an appointment. Our team at Avalon Dental in Flushing, NY is here to help patients across Bayside, Queens, Long Island, and the surrounding communities keep their smiles healthy.
Residents near Whitestone, Fresh Meadows, or Little Neck can reach our office at 201-03 Northern Blvd, 1st Floor, Flushing, NY 11361. We offer evening and weekend hours and accept a wide range of insurance plans to make cavity treatment and general dental care easy and accessible for the whole family.
