The best order is floss first, brush second, and use mouthwash at a separate time. This sequence removes the most plaque and gives your teeth the strongest dose of fluoride from your toothpaste. Here’s why each step works best in that position.
Why Flossing Comes First
Flossing before brushing loosens plaque and food debris from between your teeth, where a toothbrush can’t reach. Once that material is dislodged, brushing sweeps it away and delivers fluoride into those freshly cleaned gaps.
A clinical trial published in the Journal of Periodontology tested this directly. Participants who flossed before brushing had significantly less plaque between their teeth and across their whole mouth compared to those who brushed first. More importantly, the floss-first group had higher fluoride concentrations in the plaque between their teeth. That fluoride is what hardens enamel and prevents cavities, so getting more of it into those tight spaces matters.
The logic is straightforward: if you brush first, toothpaste deposits fluoride onto surfaces still covered with plaque. If you floss first, you clear the path so fluoride can actually contact your tooth enamel.
Brushing Comes Second
After flossing, brush for two minutes with a fluoride toothpaste. This is the main fluoride delivery step in your routine, and you want to maximize how long that fluoride stays on your teeth.
When you spit out the toothpaste, don’t rinse your mouth with water. A thin film of fluoride-rich toothpaste remains on your enamel after spitting, and it continues strengthening your teeth for at least 15 minutes. Rinsing with water washes that protective layer away. This feels odd at first if you’ve always rinsed, but it makes a real difference in fluoride exposure.
Mouthwash Works Best at a Different Time
This is the part most people get wrong. Using mouthwash right after brushing actually undermines your toothpaste. Mouthwash, even fluoride mouthwash, contains a lower concentration of fluoride than toothpaste. Swishing it around your mouth immediately after brushing replaces the concentrated fluoride film from your toothpaste with a weaker one. The NHS specifically recommends against using mouthwash straight after brushing for this reason.
The better approach is to use mouthwash at a completely separate time of day. After lunch is a popular choice because it freshens your breath and gives you a midday fluoride boost without interfering with your morning or evening brushing routine. If you eat lunch but don’t brush afterward, a fluoride rinse fills that gap nicely.
If you really want mouthwash as part of your brushing session, use it before you floss. That way, it doesn’t wash away the fluoride your toothpaste leaves behind. But using it at a separate time gives you an extra window of fluoride protection during the day, which is the bigger win.
The Complete Sequence
- Step 1: Floss to clear plaque and debris from between teeth
- Step 2: Brush for two minutes with fluoride toothpaste
- Step 3: Spit but don’t rinse with water
- Step 4: Mouthwash at a separate time, like after lunch
Timing Around Meals
If you’ve just eaten something acidic (soda, citrus juice, sports drinks, sour candy), wait at least an hour before brushing. Acid softens your enamel temporarily, and brushing while it’s soft can wear it away. Your saliva naturally neutralizes the acid and re-hardens the enamel within that hour. This is one situation where mouthwash can step in: rinsing with a fluoride mouthwash right after an acidic meal freshens your mouth without the abrasion risk of brushing.
For non-acidic meals, there’s no need to wait. Brushing after breakfast or dinner is fine as long as you follow the floss-then-brush order.
What Matters More Than Sequence
The order matters, but consistency matters more. Flossing once a day and brushing twice a day with fluoride toothpaste is the foundation. If switching to floss-first makes your routine feel awkward and you start skipping steps, that’s worse than brushing first. The best routine is one you actually do every day.
That said, if you’re already flossing and brushing regularly, switching to the floss-first order is a free upgrade. It takes zero extra time and delivers measurably better results. Saving your mouthwash for a separate time of day takes a small habit change, but it means you get full fluoride protection from both products instead of one canceling out the other.