By Dr. Joseph D. Lim
Tooth decay, also known as dental caries or cavities, is one of the most common chronic diseases worldwide. It affects people of all ages.
Tooth decay occurs when the hard outer layer of the teeth, known as enamel, is gradually destroyed by acids produced by bacteria in the mouth.
Although preventable, untreated tooth decay can lead to pain, infection and even tooth loss. Understanding how tooth decay develops — and how to prevent it — is essential for maintaining lifelong oral health.
The process of tooth decay begins with plaque, a sticky film of bacteria that constantly forms on teeth. When foods and drinks containing sugars and starches are consumed, the bacteria in plaque feed on these carbohydrates and produce acids as a byproduct. These acids attack the tooth enamel, dissolving its minerals in a process called demineralization.
If this acid exposure continues, the enamel weakens and small holes, or cavities, begin to form. Over time, decay can progress deeper into the tooth, reaching the dentin (the softer layer beneath the enamel) and eventually the pulp, where nerves and blood vessels are located. When decay reaches this stage, it can cause severe pain, infection and even abscess formation.
Several factors can increase the likelihood of developing tooth decay. Poor oral hygiene, such as infrequent brushing and flossing, allows plaque to build up and remain on the teeth for long periods. Frequent snacking or sipping sugary drinks provides a constant source of fuel for bacteria, prolonging acid attacks.
Other risk factors include a lack of fluoride, dry mouth (caused by certain medications or medical conditions), worn dental fillings, and gum recession, which exposes more vulnerable areas of the tooth. Children and older adults are particularly at risk — children because their enamel is still developing, and older adults due to receding gums and other age-related changes.
Tooth decay may not cause noticeable symptoms in its early stages, which is why regular dental checkups are vital. As the decay progresses, common signs include tooth sensitivity, pain when eating or drinking, visible holes or pits, staining on the surface of the teeth, and bad breath. In severe cases, swelling of the gums or face may occur if an abscess forms.
Treatment depends on the severity of the decay. In the early stages, fluoride treatments can help remineralize enamel and stop further damage. Once a cavity has formed, a dentist typically removes the decayed portion and restores the tooth with a filling. For more advanced decay, crowns, root canal therapy, or even tooth extraction may be necessary.
Preventing tooth decay involves maintaining good oral hygiene and healthy habits. Brushing at least twice a day with fluoride toothpaste, flossing daily, and using a fluoride mouth rinse help remove plaque and strengthen enamel. Reducing sugar intake and limiting between-meal snacks also minimize acid attacks. Regular dental checkups every six months allow for early detection and professional cleaning.
Tooth decay is a common but preventable condition that can have serious consequences if ignored.
By adopting proper oral hygiene practices, making mindful dietary choices, and visiting the dentist regularly, individuals can protect their teeth from decay and enjoy a lifetime of healthy smiles.
Prevention is always better — and far less costly — than cure when it comes to maintaining strong, healthy teeth.
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Dr. Joseph D. Lim, Ed. D., is the former Associate Dean of the College of Dentistry, University of the East; former Dean, College of Dentistry, National University; Past President and Honorary Fellow of the Asian Oral Implant Academy; Honorary Fellow of the Japan College of Oral Implantologists; Honorary Life Member of the Thai Association of Dental Implantology; and Founding Chairman of the Philippine College of Oral Implantologists. For questions on dental health, e-mail jdlim2008@gmail.com or text 0917-8591515.
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Dr. Kenneth Lester Lim, BS-MMG, DDM, MSc-OI, graduated Doctor of Dental Medicine, University of the Philippines, College of Dentistry, Manila, 2011; Bachelor of Science in Marketing Management, De La Salle University, Manila, 2002; and Master of Science (MSc.) in Oral Implantology, Goethe University, Frankfurt, Germany, 2019. He is an Associate Professor; Fellow, International Congress of Oral Implantologists; and Fellow, Philippine College of Oral Implantologists. For questions on dental health, e-mail limdentalcenter@gmail.com./WDJ