Preventing Decay & Gum Disease

Plaque bacteria on the tooth surface metabolise sugars and excrete acid. Each sugar exposure drops the pH at the tooth surface for 30–40 minutes, dissolving minute amounts of mineral. Saliva repairs this between attacks — but if attacks come too often, demineralisation outpaces repair, the enamel surface eventually collapses, and you have a cavity. It is a tug-of-war fought in minutes, decided over months.

Any fermentable carbohydrate feeds the process — that includes crisps, white bread, crackers and dried fruit, which cling to teeth longer than chocolate does. Acidic drinks cause direct erosion without bacteria being involved at all. So a 'no dessert' diet with constant snacking and fizzy drinks can be worse for teeth than one proper pudding after dinner.

It is the single most-proven intervention in dentistry — decades of research show it cuts decay substantially by making enamel more acid-resistant and helping early damage remineralise. At toothpaste concentrations it is entirely safe for adults and children (use age-appropriate amounts for small children). Spit, don't rinse, after brushing — rinsing washes the protective layer away.

Usually one of four reasons: you snack or sip sweet drinks frequently between meals; you rinse away your toothpaste; you miss the same spots every day (typically inside lower molars and between teeth); or your saliva flow is reduced by medication. A dentist can identify which applies to you — random extra effort helps less than fixing the specific leak.

Yes — genuinely. A white-spot lesion, where mineral has been lost but the surface is still intact, can re-harden with fluoride, good hygiene and diet correction. This is why we sometimes 'watch' a small lesion rather than drill it. Once the surface breaks and forms a true cavity, however, only a filling can restore it.

Because they are inflamed, and they are inflamed because plaque has sat along the gumline for days. Healthy gums do not bleed under normal brushing. The counterintuitive fix is to clean the bleeding areas more thoroughly, not to avoid them — with proper cleaning, bleeding typically resolves within one to two weeks. If it persists, you need a professional assessment.

Tartar (calculus) is plaque that has mineralised — essentially fossilised — using calcium from your own saliva. It bonds to the tooth like limescale to a kettle and is too hard for a brush; worse, its rough surface collects fresh plaque like Velcro. Only professional instruments remove it safely, which is a core reason hygiene visits exist.

No. Mouthwash reaches surfaces; it does not disrupt the sticky, organised plaque film the way mechanical cleaning does — you cannot rinse paint off a wall. A fluoride rinse used at a different time from brushing adds modest protection, and specific antiseptic rinses have short-term therapeutic uses, but as a foundation they are an accessory, not a wall.

Sugared versions are a double hit of acid plus sugar and are, frankly, the most efficient decay machines ever marketed. Sugar-free versions still sit at an enamel-dissolving pH. If you drink them, do it with a meal, through a straw, over a short period — and never sip one across a whole afternoon at a desk. That habit alone destroys otherwise healthy mouths.

Sugar-free gum after meals is genuinely helpful — it stimulates saliva, which neutralises acid and accelerates remineralisation. Gum containing xylitol adds a modest antibacterial effect. It is no replacement for brushing, but as an after-lunch habit when you cannot brush, it is one of the few 'easy wins' I recommend without reservation.

After acidic food or drink, wait about 30 minutes — the enamel surface is temporarily softened, and immediate scrubbing can wear it away. Rinse with water first, then brush later. After ordinary meals it matters less, but the general rhythm that works is: brush last thing at night and one other time daily, and keep acid and brushing apart.

Sealants are thin resin coatings that fill the deep grooves of molars — grooves often narrower than a single toothbrush bristle. They are proven to slash decay rates in those surfaces. We place them routinely in children, but adults with deep, stain-catching fissures and a history of decay benefit too. They are quick, painless and cheap compared with any filling.

Because roughly half of early decay hides between teeth and under old fillings where no light or mirror reaches. Bitewing X-rays every couple of years catch these lesions while they are still small and cheap to fix. Skipping them does not mean you have no decay — it means you find out later, when the tooth hurts and the repair is larger.

Enormously — saliva is your built-in repair and rinsing system. Hundreds of common medications (antidepressants, blood-pressure drugs, antihistamines) reduce saliva flow, and decay rates in dry-mouthed patients can be several times higher. If your mouth feels dry, tell your dentist: high-fluoride toothpaste, saliva substitutes and adjusted recall intervals genuinely change outcomes.

For patients with bridges, implants, orthodontic wires or dexterity problems, water flossers are excellent and demonstrably reduce gum inflammation. For a healthy mouth with tight contacts, string floss or interdental brushes do the mechanical job slightly better. The honest answer: the best interdental tool is the one you will actually use every day.

Susceptibility can. Enamel quality, saliva chemistry, immune response and even tooth shape have genetic components, which is why some families struggle despite decent care. You cannot change your inheritance, but knowing you are high-risk changes strategy: shorter recall intervals, sealants, high-fluoride toothpaste and stricter snacking rules compensate remarkably well.

Pregnancy hormones exaggerate the gum response to plaque, so bleeding is common — but it still means plaque is present. Meticulous but gentle cleaning, plus a professional clean in the second trimester, keeps 'pregnancy gingivitis' from becoming genuine periodontal damage. All routine hygiene care is safe during pregnancy.

Last thing at night: clean between all teeth with floss or interdental brushes, then brush two full minutes with fluoride toothpaste and spit without rinsing. One other time daily: brush again. Keep sugary and acidic intake to mealtimes, drink water between meals, and see a hygienist twice a year. That routine, kept boringly consistent, prevents the overwhelming majority of dental disease.

Through intact enamel, decay usually takes one to two years to become a cavity — which is why six-monthly checks catch it in time. But once it reaches the softer dentine underneath, progress accelerates sharply, and in a dry-mouthed or high-sugar mouth a tooth can go from 'small shadow on an X-ray' to root canal territory within a year. Early detection is everything.

Supervised brushing until at least age seven — children simply lack the dexterity before then. Make it non-negotiable like a seatbelt, use a timer or app, let them choose the brush, and brush your own teeth alongside them. Most importantly, control the sugar environment at home: a child who snacks on biscuits all afternoon cannot brush their way out of it.