8 Common Myths About Children's Teeth (and the Facts)

Every family hears advice about children's teeth from relatives, friends and social media. Some of it quietly leads to cavities. Here are eight myths I hear often, with the facts.

Myth 1: "Baby teeth don't matter, they'll fall out anyway"

Fact: Baby teeth help children chew, speak clearly and smile with confidence, and they hold space for the adult teeth underneath. Some back baby teeth stay until age 10 to 12. A decayed baby tooth can cause pain and infection, and losing one early can lead to crowding later.

Myth 2: "Soft teeth run in the family, so nothing helps"

Fact: Genes can play a part, and some children do have weaker enamel. But cavities are mainly caused by everyday habits: how often a child has sugar, and how well plaque is removed. Bacteria can also pass from parent to child, so caring for your own teeth helps too. If your family has a history of cavities, that's a reason to start prevention early, not to give up.

Myth 3: "Sugar-free juice is safe for teeth"

Fact: "No added sugar" usually still means natural fruit sugar. Many juices and fizzy drinks, including sugar-free ones, are also acidic, and acid can soften enamel even without sugar. Sipping them slowly through the day is the biggest problem. Water and plain milk remain the safest drinks.

Myth 4: "Fruit juice is healthy, so it's good for teeth"

Fact: Whole fruit is a great food. Juice is different: the fibre is removed and the sugar is concentrated. The American Academy of Pediatrics advises no juice for babies under one year, and only small amounts for older children, ideally with a meal and from a cup, not a bottle. Offer the fruit itself instead.

Myth 5: "If it doesn't hurt, there's no cavity"

Fact: Early cavities are usually painless. A child may have a cavity for months before it hurts, and by then it has often reached the nerve. Early signs include white chalky lines near the gum or brown spots in the grooves of back teeth. Regular check-ups catch decay while it is small, sometimes before it needs a filling at all.

Myth 6: "Brushing harder cleans better"

Fact: Scrubbing hard can hurt the gums and wear tooth surfaces without removing more plaque. What matters is a soft brush, gentle small circles, reaching every surface, and brushing for about two minutes. If the bristles are splayed after a few weeks, your child (or you) may be pressing too hard.

Myth 7: "Kids can brush alone from age 4"

Fact: Children love to brush "by myself", and they should practise. But most don't have the hand skills to clean every surface properly until around age 7 or 8. A good routine is: let your child have a go, then you brush again, especially the back teeth and along the gumline. At night, the parent's turn matters most.

Myth 8: "Fluoride is dangerous for children"

Fact: Used in the right amount, fluoride is one of the best-studied and most effective ways to prevent cavities. Major dental and paediatric organisations recommend fluoride toothpaste from the first tooth. The key is the amount:

• a rice-grain smear for children under 3;
• a pea-sized amount from age 3 to 6;
• spit out the extra, don't swallow it, and don't rinse with lots of water.

Keep toothpaste out of reach of little ones and supervise brushing. Fluoride varnish applied at the clinic is also safe and helpful. If you have concerns, ask your dentist to explain what's right for your child.

The bottom line

Most childhood cavities are preventable with twice-daily fluoride brushing, parent help until 7 or 8, sweets and juice kept to mealtimes, water as the main drink, and regular check-ups.