Cavities — also called dental caries or tooth decay — are permanently damaged areas on the hard surface of your teeth that develop into tiny holes. They're one of the most common health problems in the world, affecting people of all ages.
The good news? Cavities are largely preventable. Let's break down what's happening in your mouth and what you can do about it.
How Cavities Form
Your mouth is home to hundreds of types of bacteria. Some are helpful, but others feed on the sugars in the food you eat and produce acids as a byproduct. These acids attack your tooth enamel — the hard, outer layer of your teeth.
Here's the process, step by step:
- Plaque forms. Bacteria combine with food particles, saliva, and acids to form a sticky film called plaque that coats your teeth.
- Acids attack. The acids in plaque dissolve minerals in your enamel, creating tiny openings or holes — the earliest stage of a cavity.
- Decay spreads. Once enamel is breached, bacteria and acid can reach the softer layer underneath (dentin), and eventually the inner tooth pulp.
Common Symptoms
Cavities don't always announce themselves. In the early stages, you might not feel anything at all. As they progress, watch for:
- Tooth sensitivity, especially to hot, cold, or sweet foods
- Visible holes or pits in your teeth
- Staining — brown, black, or white spots on tooth surfaces
- Pain when biting down
- A spontaneous toothache that seems to come from nowhere
When to see a dentist: If you notice any of these symptoms, schedule a visit sooner rather than later. Catching cavities early means simpler, less expensive treatment.
Who's at Risk?
While anyone can get cavities, some factors increase your risk:
- Frequent snacking — especially sugary or starchy foods
- Not brushing enough — or not brushing effectively
- Dry mouth — saliva helps wash away food and neutralize acids
- Location of teeth — back teeth (molars) are more prone due to their grooves
- Age — very young children and older adults are at higher risk
Prevention: Your Daily Defense
Preventing cavities is surprisingly straightforward:
- Brush twice a day with fluoride toothpaste for at least two minutes
- Floss daily to clean between teeth where your brush can't reach
- Limit sugary snacks and drinks, especially between meals
- Stay hydrated — water helps rinse away food particles and bacteria
- Visit your dentist regularly for cleanings and checkups
- Consider sealants — a protective coating applied to the chewing surfaces of back teeth
The Bottom Line
Cavities are incredibly common, but they're also one of the most preventable dental problems. By understanding how they form and building good daily habits, you can keep your teeth healthy and avoid the discomfort (and expense) of treatment.
If it's been a while since your last checkup, this is your gentle nudge to schedule one. Your future self will thank you.