What is a Filling — and How to Prevent Cavities
- stephbrowndds
- Jul 15
- 4 min read
As a dentist, I've seen firsthand how preventive care and early intervention can save patients time, money, and discomfort. In this post, I'll explain what dental fillings are, why we use them, and the practical steps you can take to avoid needing one in the first place.
What is a dental filling?
A filling is a straightforward restorative procedure I perform regularly in my practice. When a tooth develops decay (a cavity), the affected structure weakens and becomes a pathway for bacteria to reach deeper tissues. During the procedure, I remove all decayed material and replace it with a durable filling material. This stops the decay, restores the tooth's function, and prevents the problem from worsening.
The goal is simple: preserve as much of your natural tooth as possible and keep you comfortable and healthy (midtowntorontodentistry.com).
Filling materials I use in practice
In my clinic, I typically recommend one of these materials based on the location and extent of decay:
Composite resin (tooth-coloured): This is my first choice for most patients, especially visible teeth. It bonds directly to the tooth, looks natural, and requires less removal of healthy tooth structure.
Amalgam (silver): A time-tested, highly durable material I reserve for back molars where aesthetics are less of a concern. It's particularly reliable for large restorations.
Porcelain or ceramic: For larger cavities or when patients want the most aesthetic outcome, porcelain inlays and onlays are excellent choices—they're custom-fabricated and extremely durable.
Glass ionomer: I use this for smaller cavities near the gum line because it releases fluoride and helps protect the tooth over time.
For a full overview of restorative options at my practice, see: midtowntorontodentistry.com.
When you need a filling
Over the years, I've noticed patients often don't realize they have a cavity until I find it during an exam. Here are the signs I look for—and what you should watch for at home:
A visible hole, pit, or dark/brown spot on the tooth.
Sensitivity to sweets, hot, or cold temperatures.
Pain when chewing or biting.
Decay detected on X-rays during a routine checkup.
If you've lost or damaged a filling, don't wait. Contact us promptly—temporary measures can help manage the situation until I can see you in the chair (midtowntorontodentistry.com).
How I place a filling — the process explained
Here's what happens when you're in my chair:
Anaesthetic: I numb the tooth and surrounding area so you remain comfortable throughout.
Decay removal: Using specialized instruments, I carefully remove all decayed material.
Preparation: The tooth is cleaned and shaped to receive the filling material.
Placement: I place and shape the filling material to restore the tooth's contour and function.
Finishing: I polish the filling and check your bite to ensure proper alignment.
The entire procedure typically takes 30–60 minutes, depending on the size and location of the cavity.
Watch a quick video of what to expect during the procedure
How to prevent cavities — what I tell my patients
Prevention is always easier than treatment, and it's the advice I give to every patient who walks through my door. Here's what works:
Daily oral hygiene
Brush twice daily with a fluoride toothpaste for at least two minutes. Most people rush—take your time.
Floss once daily. This is non-negotiable. Floss reaches areas your toothbrush can't, and that's where many cavities start.
Consider a waterpik, especially if you have numerous restorations, any implants or bridges or braces.
Smart eating habits
Limit sugary and acidic drinks. Soda, energy drinks, and even fruit juice bathe your teeth in acid and sugar. When you do have them, use a straw and rinse with water afterward.
Avoid constant snacking. Each time you eat, your teeth are exposed to acid for about 20 minutes. Frequent snacking means prolonged acid exposure; stick to meals and one or two snacks.
Choose water over other beverages when possible. Water is the best drink for your teeth.
Regular professional care
See me every 3-6 months for a checkup and cleaning. At this interval, I can spot early decay before it becomes a problem requiring a filling.
Ask about fluoride treatments. Professional fluoride applications strengthen enamel and are especially helpful for patients at higher risk.
Discuss sealants, particularly if you have children. Sealants on the chewing surfaces of molars are highly effective at preventing decay in those hard-to-clean grooves.
Other protective measures
Don't use your teeth as tools. I see cracked teeth all the time from patients opening packages or bottles with their teeth—stop doing that.
Avoid tobacco products. Tobacco increases your risk of gum disease, which accelerates tooth loss.
Address dry mouth. If you notice your mouth is chronically dry, tell me. Saliva is your mouth's natural defence against decay, and low saliva significantly raises cavity risk. We can discuss solutions.
Manage stress and grind awareness. Teeth grinding (bruxism) weakens enamel and makes teeth more susceptible to decay. If you suspect you grind, let me know—a night guard can help.
For detailed information about preventive services at my practice, visit: midtowntorontodentistry.com.
Red flags — when to call me sooner
Don't wait for your next scheduled appointment if you experience:
Persistent toothache or sensitivity that doesn't improve within a few days.
Visible chips, cracks, or holes in your teeth.
Swelling, fever, or drainage around a tooth (signs of infection).
A lost or dislodged filling—this leaves the tooth vulnerable.
If you need urgent care, head to our emergency page for immediate guidance: midtowntorontodentistry.com.
For common questions my patients ask about fillings and other treatments, check the FAQ: midtowntorontodentistry.com.
The bottom line
Fillings are quick, effective, and routine—but prevention is always better. Brush, floss, eat wisely, and see your dentist regularly. If you do develop a cavity, catching it early means a simpler, less costly treatment and a healthier tooth long-term.
If you're in Toronto and want to discuss your oral health, schedule a checkup, or have concerns about cavities, I'd be happy to see you. Book an appointment or reach out:
midtowntorontodentistry.com📞 (416) 482-7000📧 info@mtdentistry.ca📍 1849 Yonge Street, Toronto
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