Brushing harder does not get teeth cleaner. Plaque is soft and comes away with light pressure, so the people who scrub hardest often end up with worn enamel and receding gums while still missing the strip of plaque right at the gumline. Good brushing is mostly about where the bristles go and how long they stay there.
Plaque collects at the gumline, so aim there
The edge where tooth meets gum is where plaque builds up first and where both decay and gum disease tend to start. Many people brush the middle of each tooth and glide over that edge. The Australian Dental Association suggests holding the brush at a 45 degree angle towards the gums, so the bristles sit partly on the tooth and partly on the gum, and brushing gently in small circles. Side to side scrubbing can damage teeth and gums.
Think of it as sweeping rather than sanding. Let the tips of the bristles do the work, with only enough pressure to keep them in contact. If a new brush looks splayed and flattened within a few weeks, you are pressing too hard.
Two minutes, with a route through the mouth
The usual advice is two minutes, twice a day. That is longer than it feels, and many people stop well short of it. A timer on your phone or an electric brush helps, and so does splitting the mouth into four quarters with about 30 seconds each.
Following the same route every time stops you skipping areas. Do the outside surfaces, then the inside surfaces, then the chewing surfaces, one quarter at a time. The inside of the lower front teeth is a common place for tartar to build up, and it is easier to reach if you turn the brush upright and use the tip. Slow down at the very back teeth too, as the last tooth on each side is often missed.
Spit, but skip the rinse
When you finish, spit out the foam and leave it there. Rinsing with a mouthful of water washes away the fluoride that is still sitting on your teeth, and the ADA advises not rinsing after brushing. If the taste bothers you, it usually fades within a few minutes.
The night brush matters most
Saliva flow drops while you sleep, so there is less to rinse away food and neutralise acid overnight. Brushing just before bed leaves a layer of fluoride on the teeth for those hours. If you are going to miss one brush, it should not be this one.
Brushing after acidic food or drink
You may have heard that you should wait before brushing after fruit, wine, soft drink or coffee. The evidence for a fixed waiting time is weaker than the advice suggests. A 2024 scoping review in Caries Research (Fernández and colleagues) found that most studies showed brushing with a fluoride toothpaste did not increase erosive wear, whatever the timing. A rinse with water after an acidic drink is still a sensible habit. If you already have significant erosion, your dentist may give you advice specific to your teeth, and our article on enamel erosion explains the causes.
Choosing a brush and toothpaste
Pick a soft brush with a small head that reaches your back teeth easily. Manual and electric brushes both work in good hands. A Cochrane review (Yaacob and colleagues, 2014) found powered brushes reduced plaque and gingivitis modestly more than manual ones, and the built-in timers help many people reach two minutes. We compare the two in our guide to electric versus manual toothbrushes.
Replace your brush or brush head about every three months, or sooner if the bristles splay. Some guidance also suggests a new brush after a cold or flu, although there is little evidence that reusing a brush causes reinfection.
Fluoride toothpaste is what protects the enamel. For adults a pea-sized amount is enough, and your dentist may suggest a higher-strength fluoride toothpaste if you are at higher risk of decay. Children follow different guidance: no toothpaste before 18 months unless a dentist advises it, then a smear of low-fluoride children's toothpaste from 18 months to 6 years, and a pea-sized amount of standard fluoride toothpaste from 6 (Australian Dental Association, teeth.org.au). Help young children brush until they can do it well on their own. If you have questions about fluoride itself, our explainer on whether fluoride is safe looks at the evidence.
The surfaces a brush cannot reach
A toothbrush cleans the outside, inside and chewing surfaces well, but not the sides where neighbouring teeth touch. Those gaps need floss or interdental brushes once a day. Our guide on how to floss properly shows the technique, common flossing mistakes covers what tends to go wrong, and if you are wondering whether a rinse adds anything, see do you need mouthwash.
Signs your brushing needs a second look
Gums that bleed when you brush are usually inflamed by plaque that has been missed, so keep brushing gently and cleaning between the teeth rather than avoiding the area. If the bleeding has not settled after 3 to 4 days of good brushing and flossing, see a dentist or oral health therapist (OHT). Our guide to bleeding gums explains the common causes.
Other signs worth having checked include new sensitivity near the gumline, gums that look like they are pulling back, persistent bad breath and hard build-up you can feel with your tongue. Brushing cannot remove tartar once it has hardened; that needs a professional clean.
Questions we are often asked
Should I floss before or after brushing?
Either works. Cleaning between the teeth first may help toothpaste reach those surfaces, but doing both every day matters far more than the order.
Is brushing before or after breakfast better?
Both are fine. Brushing before breakfast puts fluoride on your teeth before you eat, while brushing after removes food. Choose the time you will stick to.
Have your technique checked
At a check-up and clean, your dentist or OHT can show you the spots you tend to miss and suggest the right brush and toothpaste for your mouth. To book with our team at Lumi Dental in Melrose Park, visit our general dentistry page, or see our current offers. If treatment is needed, you will usually receive a written treatment plan, often by email.
