What Parents Should Know About Cavities in Baby Teeth

I hear this often: 'It's just a baby tooth, it will fall out anyway.' I understand the reasoning, but it reflects a common misunderstanding about what baby teeth actually do, and what happens when they are lost too early or left untreated.

What baby teeth are actually for

• •Space holders: Each baby tooth holds a precise space in the jaw for the permanent tooth developing beneath it. When a baby tooth is lost early, whether pulled due to decay or lost to infection, neighbouring teeth drift into that space. The permanent tooth then erupts crooked, crowded, or sometimes blocked entirely. This is one of the most common reasons children need orthodontic treatment.
• •Speech development: The front teeth in particular are essential for producing sounds like 's', 'z', 'th', and 'f'. Children who lose front teeth early due to severe decay often develop speech difficulties that require therapy.
• •Chewing and nutrition: A child who cannot chew comfortably avoids hard vegetables, lean proteins, and other nutritious foods. Dental pain is a frequently overlooked cause of poor nutrition in young children.
• •Confidence: Children with visible decay or missing front teeth are often teased, and many become self-conscious about their smiles years before they reach adolescence.
• •The permanent teeth beneath: Severe infection in a baby tooth can damage the developing permanent tooth beneath it, causing discolouration, enamel defects, or structural problems.

How cavities progress in baby teeth

Baby tooth enamel is thinner and softer than permanent tooth enamel. This means cavities progress faster, a small cavity that might take a year to reach the nerve in an adult tooth can do so in a few months in a child. A cavity that looks like a small white or brown spot in March might require a pulp treatment (nerve treatment) by June if it is not addressed.

Stages of tooth decay and what they mean

1. 1White spot lesions: The earliest stage, where minerals are beginning to leach from the enamel. At this point, the damage can be reversed with fluoride treatment and dietary changes. No drilling required.
2. 2Enamel cavity: A hole has formed in the outer layer. A simple filling is all that is needed, quick, painless with proper numbing, and done in a single visit.
3. 3Dentine cavity: The cavity has reached the layer beneath the enamel. The tooth becomes sensitive to cold and sweet. A filling is still usually sufficient, but it needs to happen quickly.
4. 4Pulp involvement: The cavity has reached the nerve. The child will often experience pain, especially at night. A pulpotomy (partial nerve treatment) or pulpectomy (complete nerve treatment) is needed, followed by a stainless steel crown.
5. 5Abscess: Infection has spread beyond the tooth into the surrounding tissue. The tooth may need to be removed if it cannot be saved. A space maintainer will then be needed.

The highest-risk situations

• •Bottle or sippy cup with milk or juice at bedtime or nap time: Liquid pools around teeth while the child sleeps, and salivary flow (which neutralises acid) drops during sleep. This is the single biggest risk factor for early childhood caries.
• •Frequent sugary snacks: Every exposure to sugar triggers 20–30 minutes of acid production. Frequent snacking keeps teeth under constant acid attack.
• •Sweet medicines: Liquid paracetamol, cough syrups, and multivitamins are often sweetened. If your child takes these regularly, make sure teeth are cleaned afterwards.
• •Family history: The bacteria that cause cavities can be passed between family members through shared spoons, kissing, and tasting food before giving it to a baby.

Prevention that actually works

• •Brush twice daily from the first tooth, using a smear of fluoride toothpaste.
• •No bottles or sippy cups in bed after the first birthday. Water is the only acceptable bedtime drink.
• •Professional fluoride varnish every six months from a dentist.
• •Fissure sealants on back teeth as soon as the permanent molars erupt (around age six).
• •Six-monthly dental check-ups to catch problems at stage one or two, not stage four or five.

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