Dental Cavities in Bangladesh: Why Tooth Decay Is So Common and How to Prevent It

Introduction

Dental caries — commonly called tooth decay or cavities — is damage to the hard tissue of a tooth caused by acids produced by bacteria in dental plaque. WHO describes untreated caries in permanent teeth as the single most common health condition worldwide, and it affects both children and adults.

Decay develops gradually. In its earliest stage it causes no pain at all, which is why many people only discover a cavity once it has already reached the deeper layers of the tooth.

Why this matters in Bangladesh

The WHO Oral Health Bangladesh 2022 country profile — a national estimate compiled from WHO's global oral health data, not a measurement of any individual — reports:

• Untreated caries of deciduous (milk) teeth in children aged 1–9 years: 43.5% (WHO Bangladesh 2022 country profile).
• Untreated caries of permanent teeth in people aged 5 years and older: 30.4% (WHO Bangladesh 2022 country profile).

How to read those numbers honestly

These figures are country-level estimates published in 2022. They do not mean that everyone in Bangladesh has cavities, and they cannot tell you whether you personally have decay — only a clinical examination, sometimes with an X-ray, can do that. What they do show is that untreated decay is common enough to be a national public health priority, which is one reason Bangladesh endorsed its first National Oral Health Strategy and Action Plan 2025–2030.

How a cavity forms

• Plaque — a sticky film of bacteria — builds up on teeth when brushing is incomplete.
• Those bacteria turn free sugars from food and drink into acid.
• The acid dissolves minerals from the enamel. Saliva and fluoride can repair very early damage.
• When acid attacks happen often enough, the loss outpaces the repair and a cavity forms.

Common risk factors

• Frequent free-sugar intake. In everyday Bangladeshi routines this often means sweetened tea or coffee several times a day, soft drinks and energy drinks, mishti and other sweets, biscuits, and sugary snacks between meals. How often sugar is consumed matters as much as how much.
• Inadequate exposure to fluoride, for example brushing with a toothpaste that does not contain fluoride.
• Brushing that is too brief, too rushed, or misses the back teeth and the gumline.
• Dry mouth, which reduces saliva's natural protective effect.
• Delayed dental visits, so early decay is not detected while it is still small and simple to treat.
• In young children, frequent sweetened drinks — especially at bedtime or in a feeding bottle.

Early signs and symptoms

• White, chalky or brown spots on the tooth surface.
• Sensitivity to cold, hot or sweet food and drink.
• Food repeatedly getting stuck between the same two teeth.
• A visible hole, chip or rough edge you can feel with the tongue.
• Toothache — often a later sign, meaning decay has advanced.
• Swelling of the face or gum, a bad taste, or pain that wakes you at night. These can indicate infection and need prompt dental care.

Prevention that is supported by evidence

• Brush twice a day with a fluoride toothpaste — this is the core protective habit recommended by WHO.
• Use a soft brush at a slight angle to the gumline, in short gentle strokes, and take about two minutes to cover every surface including the back teeth.
• Spit after brushing; avoid rinsing heavily with water immediately, so fluoride stays in contact with the teeth.
• Reduce how often free sugars are consumed, not just the total amount — fewer sweet tea breaks and fewer sugary snacks between meals.
• Choose plain water as the routine drink, especially between meals and at bedtime.
• Clean between the teeth daily where the brush cannot reach.
• Supervise young children's brushing and use an age-appropriate amount of fluoride toothpaste.
• Have a dental examination at the interval your dentist advises, so early decay is caught before it causes pain.

What treatment generally involves

Very early enamel damage may be managed without drilling, using fluoride and improved home care so the surface can remineralise. Once a cavity has formed, the damaged tissue is removed and the tooth is restored with a filling. Deeper decay reaching the nerve may require root canal treatment, and a badly damaged tooth may need a crown. A tooth that cannot be saved may need to be removed and later replaced.

The specific treatment always depends on the individual diagnosis after clinical examination and, where needed, radiographs. Home remedies cannot reverse a cavity that has already broken through the enamel, and they cannot treat a dental infection.

When you should see a dentist

• Sensitivity or discomfort that lasts more than a few days.
• A visible hole, dark spot or broken tooth.
• Persistent toothache, or pain that disturbs sleep.
• Facial or gum swelling, fever, or a bad taste in the mouth — seek care urgently.
• For children: any dark spot on a milk tooth, or complaints while eating.