The most damaging dental myths are that scaling loosens teeth (it removes tartar that was masking existing bone loss), that root canal treatment causes systemic illness (based on a discredited 1920s theory), that cavities in milk teeth do not matter (they cause pain, infection and crowding of permanent teeth), and that teeth only need treatment when they hurt (dental pain appears late, often after the nerve is already involved).
Myth 1: Scaling loosens your teeth
This is the one we hear most. Ultrasonic scaling removes hardened tartar; it does not remove enamel and cannot loosen a healthy tooth. In advanced gum disease, heavy tartar bridges the gaps between teeth and splints together teeth that have already lost bone. Remove it and mobility that was always present becomes noticeable. The cleaning revealed the problem. Leaving the tartar would have accelerated the bone loss beneath it.
Myth 2: Root canal treatment causes disease elsewhere in the body
This traces back to the 'focal infection theory' of the 1910s–20s, which was abandoned decades ago because the research behind it lacked controls. It resurfaces regularly online. A properly performed root canal removes infection; leaving an abscessed tooth in place is what actually risks spreading bacteria.
Myth 3: Cavities in milk teeth do not need treating
Milk teeth hold space for the permanent teeth behind them and are lost on a schedule that matters. Untreated decay causes pain, infection, damage to the developing permanent tooth underneath, and — when the tooth is lost early — crowding that later needs braces.
Myth 4: If it does not hurt, nothing is wrong
This is the costliest myth of all. Decay is painless until it approaches the nerve. Gum disease is famously painless until teeth loosen. Oral cancer is typically painless in its early stages. By the time a dental problem hurts, the cheap window for treating it has usually closed.
Myth 5: Harder brushing cleans better
Pressure does not remove plaque; contact and technique do. Hard brushing wears notches into the tooth at the gum line and pushes the gum into recession, producing exactly the sensitivity people then buy special toothpaste for. Hold the brush in your fingertips, not your fist.
Myth 6: Charcoal and baking soda whiten teeth
They abrade the surface. Removing surface stain looks like whitening briefly, while the enamel gets thinner. Since the dentine underneath is naturally yellow, thinner enamel means darker teeth over time. The remedy causes the problem it advertises.
Myth 7: Pregnant women should avoid all dental treatment
The opposite is closer to true. Pregnancy gingivitis is common, and untreated gum disease is associated with preterm birth and low birth weight. Routine cleaning and necessary treatment are safe, with the second trimester the most comfortable window. Tell us you are pregnant so we can plan appropriately.
Myth 8: Dental X-rays are dangerous
A digital dental X-ray delivers a very small dose — comparable to a short domestic flight, and a fraction of natural annual background radiation. The real risk lies in diagnosing blind: decay between teeth, infection at a root tip and bone loss are simply invisible without one.
Myth 9: Losing teeth is a normal part of ageing
It is common, not normal. Tooth loss is caused by decay and gum disease, both of which are preventable and treatable. There is no biological process that requires an eighty year old to lose teeth.
Myth 10: Sugar-free means tooth-safe
Not necessarily. Many sugar-free fizzy drinks and fruit juices are strongly acidic and erode enamel directly, without any bacterial involvement. Erosion and decay are different processes with the same ending.
Myth 11: A tooth that has been treated cannot decay again
Fillings and crowns do not make a tooth immune. Decay commonly restarts at the margin where the restoration meets the tooth. Root-canal-treated teeth can also decay — they just cannot feel it, which is why it is often caught late.
Myth 12: You only need a dentist when something goes wrong
A checkup exists to find things while they are small and cheap. A cavity caught early is a filling; the same cavity found eighteen months later is a root canal and a crown.
Myth 13: Antibiotics will fix a toothache
Antibiotics can temporarily reduce swelling but cannot reach the inside of a dead tooth, which has no blood supply. The infection returns once the course ends. The source has to be treated — drained, root-treated, or removed.
Myth 14: Mouthwash can replace brushing or flossing
Plaque is a biofilm, physically attached to the tooth. Rinsing does not dislodge it, and no mouthwash removes tartar. Rinses are an adjunct to mechanical cleaning, never a substitute.
Questions we get asked
Which dental myth causes the most damage?
'If it does not hurt, nothing is wrong.' Decay, gum disease and oral cancer are all painless early on. This single belief is why most patients arrive when the cheap treatment window has already passed.
Is it true that you should not brush immediately after vomiting or acidic food?
Yes — this one is true. The enamel is temporarily softened by acid, and brushing then scrubs it away. Rinse with plain water and wait about thirty minutes.
Do teeth need to be 'saved' at any cost?
No. Sometimes extraction is the right answer — a vertically fractured tooth or one with severe bone loss may not be restorable. A dentist who never recommends extraction is not being honest with you either.