Cavities and Tooth Decay: Causes, Signs, and How to Treat Them

Overview

Cavities and tooth decay are among the most common oral health problems worldwide. They occur when the hard surface of your teeth, called enamel, is damaged by acids produced by bacteria. Over time, these acids can create tiny holes (cavities) that grow larger and deeper if left untreated.

Tooth decay can affect anyone, but the good news is it’s both preventable and treatable when detected early.

What Causes Cavities?

The cause of cavities begins with a simple chain reaction in your mouth:

  1. Plaque formation – When you eat or drink sugary or starchy foods, bacteria in your mouth feed on those sugars and form a sticky film called plaque.
  2. Acid attack – The bacteria in plaque produce acid that erodes the enamel on your teeth.
  3. Enamel breakdown – Over time, repeated acid attacks wear away the enamel, leading to small openings or holes — the first stage of tooth decay.
  4. Progression to deeper layers – As decay spreads into the dentin and pulp, it can cause pain, infection, and even tooth loss if not treated.

Common Risk Factors of Cavity and Tooth Decay Include:

  • Poor brushing or flossing habits
  • Frequent snacking or sipping sweet drinks
  • Dry mouth (less saliva to neutralise acids)
  • Acidic foods or reflux conditions
  • Worn dental fillings or misaligned teeth that trap plaque

Symptoms of Tooth Decay

In its early stages, tooth decay might not cause noticeable discomfort. But as the decay worsens, symptoms become more obvious. Watch out for:

  • Toothache or spontaneous pain
  • Sensitivity to sweets, cold, or heat
  • Visible holes or pits in your teeth
  • Brown, black, or white staining on the tooth surface
  • Pain when biting down
  • Bad breath or a persistent, unpleasant taste

If you experience any of these signs, schedule a dental check-up promptly. Early intervention can prevent the decay from spreading and save your tooth.

How Tooth Decay Is Treated

Tooth decay treatment depends on the extent of the damage. Your dentist will evaluate your teeth and recommend the best dental decay treatment option:

  1. Fluoride Treatment
    • For early-stage decay, fluoride can help restore weakened enamel before a cavity forms.
    • This may be applied as a gel, foam, or varnish during your dental visit.
  2. Dental Fillings
    • Once a cavity develops, your dentist will remove the decayed portion (known as tooth decay removal) and fill the area with composite resin, amalgam, or other materials.
  3. Dental Crowns
    • If the decay is extensive, the damaged part of the tooth may be removed and covered with a crown to protect and restore its function.
  4. Root Canal Treatment
    • When decay reaches the tooth’s pulp (inner nerve), a root canal is needed to remove the infected tissue and seal the tooth to prevent further infection.
  5. Tooth Extraction
    • In severe cases where the tooth cannot be saved, it may need to be removed and replaced with an implant, bridge, or denture.

Preventing Cavities and Tooth Decay

The most effective way to avoid dental decay is to prevent it before it starts. Here’s how:

  • Brush twice daily with fluoride toothpaste
  • Floss or use interdental brushes every day
  • Limit sugary snacks and drinks
  • Rinse with a fluoride mouthwash
  • Drink plenty of water, especially after meals
  • Visit your dentist for regular check-ups and cleanings

When to See a Dentist

You should see a dentist as soon as you notice tooth pain, sensitivity, or visible damage. Even if you have no symptoms, regular dental visits are key to catching early signs of decay — when tooth decay treatment is simplest and most effective.

The Bottom Line

Cavities and tooth decay don’t develop overnight, but ignoring early signs can lead to lasting damage. Understanding the causes of cavities and maintaining consistent oral care can help you protect your teeth for life.

Regular dental check-ups are the best way to detect and treat cavities early. If you’re noticing signs of decay or tooth sensitivity, book a consultation today. Our dental team can guide you through the best tooth decay treatment for your needs.

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