Cavities are not caused by sugar alone. They are caused by how often teeth are exposed to sugars and starches, how long the acid stays on the tooth, and how well the tooth is cleaned and strengthened between exposures.
How decay actually forms
Bacteria in dental plaque feed on sugars and starches from food and drink and produce acid. That acid removes minerals from enamel. Saliva and fluoride put minerals back. Decay begins when the losing side wins consistently — usually because exposures are frequent, not because one meal was sweet.
This is why constant sipping and nibbling matter more than the size of a dessert. A sweet drink finished in ten minutes is one acid attack. The same drink sipped over two hours is many.
The habits with the biggest effect
A small number of changes account for most of the benefit.
- Brush twice daily with a fluoride toothpaste, including last thing at night
- Supervise or do the brushing yourself until your child can do it thoroughly — usually around age seven or eight
- Keep sweet foods and drinks to mealtimes rather than spread through the day
- Give water or plain milk between meals, not juice, squash or fizzy drinks
- Never send a child to bed with a bottle of milk, juice or anything sweetened
- Keep regular check-ups so early decay is found while it is still reversible or small
Baby teeth matter
A common assumption is that decay in baby teeth is not serious because those teeth will fall out anyway. Baby teeth guide the adult teeth into place, support chewing and speech, and can cause real pain and infection when badly decayed. Untreated decay in baby teeth also raises the risk of decay in the adult teeth that follow.
Signs worth an appointment
Book a check if you see white chalky bands near the gum line, brown or black spots, a hole or chip, persistent bad breath, bleeding gums, or if your child avoids chewing on one side or complains of sensitivity to cold or sweet foods.
The short version
Frequency is the lever most families can pull. Fewer sugar exposures per day, plus thorough fluoride brushing at night, prevents more decay than anything else you can do at home.
This article gives general dental health information and is not a diagnosis or a treatment plan for your child. For advice specific to your family, please speak to our team at the clinic.