Dra. Cléo Salustiano In this article
SummaryStep by step: how to floss without hurting your gumsFloss or interdental brush, bleeding gums and pregnancyFAQRead nextHow to Floss Properly: Step by Step and Common Questions
Quick summary of this article+
To floss properly, use about 40 centimeters, wind it around your middle fingers, ease it between the teeth with a gentle back-and-forth motion, curve it into a "C" around each tooth and slide slightly below the gumline, using a clean section for each gap, once a day. For larger spaces, such as receding gums, bridges, implants or braces, an interdental brush usually cleans better. Bleeding when flossing usually indicates gingivitis and tends to decrease with daily flossing; if it persists, get an assessment. Pregnant women can and should floss. In Mooca, Dr. Cléo Salustiano (CRO-SP 170844) sees patients every day, from 8 a.m. to 10 p.m.
To floss properly, cut a piece of about 40 centimeters (16 inches), wind the ends around your middle fingers, ease the floss between the teeth with a gentle back-and-forth motion, curve it into a "C" shape around each tooth and slide it slightly below the gumline without snapping it into the gum. Do both sides of every gap, including behind the last tooth, using a clean section of floss for each space. Once a day, done calmly, already makes a difference.
A toothbrush alone does not reach the surfaces between the teeth well, and those are exactly where plaque builds up easily and where many cavities and gum problems begin. That is why floss, or an interdental brush when the gaps are larger, completes your oral hygiene. In clinical practice, patients often say they stopped flossing because "my gums bled": most of the time, bleeding is a sign of inflamed gums, not a sign that flossing is harmful.
Dr. Cléo Salustiano (CRO-SP 170844), a dentist in Mooca, São Paulo, explains the step-by-step technique, the most common mistakes, when to switch to an interdental brush, what to do if your gums bleed and how to floss during pregnancy.
This article comes from Dr. Cléo Salustiano's dental office in Mooca, São Paulo (care in English, Portuguese and Spanish). See the dental cleaning page to learn how the treatment is done here and book your assessment.
Step by step: how to floss without hurting your gums
1. Measure the floss: about 40 centimeters, roughly the length of your forearm. Wind most of it around one middle finger and the rest around the other, leaving 3 to 5 centimeters between your hands. Your thumbs and index fingers hold and guide it. 2. Go in gently: place the floss at the contact point between two teeth and use a light sawing motion until it slips through. Avoid forcing it in one go, because the floss can snap down and cut the gum.
3. Hug the tooth in a "C": once between the teeth, curve the floss against the side of one tooth and slide it up and down, going gently a little below the gum until you feel slight resistance. Then curve it against the neighboring tooth and repeat. The goal is to scrape plaque off the tooth surface, not to saw at the gum. 4. Use a fresh section: unwind a clean piece for each gap. 5. Do not forget the back: floss behind the last molars too, where brushing often misses.
Common mistakes: only passing the floss through the middle of the gap without touching the sides of the teeth; snapping it hard into the gum; reusing the same piece; rushing and doing only the front teeth; and giving up in the first days because of bleeding. Floss or tape? Both work. Wider tape often glides better between very tight teeth, and waxed floss helps if your floss keeps shredding. A floss threader makes things easier with fixed braces, a bridge or a bonded retainer.
Floss before or after brushing? Both orders work; what matters most is doing it well every day. Many dentists suggest flossing first, because loosening plaque between the teeth helps the fluoride toothpaste reach those areas when you brush afterwards. To review your brushing technique, see how to brush your teeth properly.
| Tool | Suited for | Note |
|---|---|---|
| Dental floss | Tightly spaced teeth, daily use | "C" motion, a clean section per gap |
| Dental tape | Very tight teeth or floss that shreds | Glides more easily |
| Interdental brush | Larger gaps, receding gums, bridges, implants, braces | Should fit without forcing |
| Floss threader | Fixed braces, bridges, bonded retainers | Helps floss pass underneath |
| Water flosser | Extra help with braces and implants | Usually does not replace floss or brushes |
Floss or interdental brush, bleeding gums and pregnancy
Floss or interdental brush? It depends on the size of the gaps between your teeth. Where teeth touch tightly, floss is what fits. Where the spaces are larger, such as with receding gums, after gum treatment, around bridges, implants or braces, an interdental brush usually cleans more easily, because it fills the space and reaches the hollows of the root. The brush should go in without forcing and without being too loose, and your dentist can tell you which sizes suit each area. Many people use both: floss where it is tight, small brushes where it is wide. A water flosser can be a helpful extra, especially with braces or implants, but it usually does not replace mechanical plaque removal.
Gums bleed when flossing: what should you do? In most cases, bleeding means gingivitis, an inflammation caused by plaque that has been sitting in exactly the spaces the floss was not reaching. The usual advice is to keep going, gently, every day: with daily plaque removal, bleeding tends to decrease within a few days to a few weeks. If it persists, or comes with very red or sore gums, constant bad breath, teeth that look longer or feel loose, get an assessment, as there may be tartar or periodontal disease. The article bleeding gums when brushing covers these signs.
Can you floss during pregnancy? Yes, and you should. Hormonal changes make the gums more reactive to plaque, and so-called pregnancy gingivitis is common: gums swell and bleed more easily. Keeping up flossing and brushing with gentle movements is an important part of care during this period. If your gums are very inflamed, a professional cleaning can safely be done during pregnancy, based on your dentist's assessment; see dental cleaning during pregnancy.
Flossing reduces plaque build-up, but it does not remove tartar that has already formed: that only comes off with a professional cleaning. This content is for information only and does not replace an exam. Consult a dentist if your gums keep bleeding for more than two weeks despite daily hygiene, if the floss always tears at the same spot (which may point to a cavity or a filling with a rough edge) or if you are unsure which tool to use. In Mooca, Dr. Cléo Salustiano sees patients every day, from 8 a.m. to 10 p.m., including Sundays and holidays, offering dental cleaning and personalized hygiene guidance at her office in Mooca.
What is the right way to floss?
+
Use about 40 centimeters wound around your middle fingers. Ease the floss between the teeth with a gentle back-and-forth motion, curve it into a "C" against the side of each tooth and slide it up and down, going slightly below the gum. Use a clean section for each gap and do not forget behind the last tooth.
How often should I floss?
+
Once a day, done well, is the most common recommendation. Many people prefer the evening, before bed, when there is time to do it calmly. People with braces, implants or a tendency to build up plaque may get different advice from their dentist.
Is it normal for gums to bleed when I floss?
+
It is common, but not a sign of healthy gums: bleeding usually indicates gingivitis. If you keep flossing gently every day, it tends to decrease within a few days to a few weeks. If it does not improve, or comes with pain, bad breath or loose teeth, get an assessment.
Floss or interdental brush: which suits me?
+
It depends on the spaces between your teeth. Where teeth touch, floss fits better. Where there is more space, such as receding gums, bridges, implants or braces, an interdental brush usually cleans more efficiently. Your dentist can recommend the right size for each area.
Can I floss while pregnant?
+
Yes, and it is recommended. During pregnancy, gums become more sensitive to plaque and can swell and bleed more easily. Gentle flossing and brushing help control pregnancy gingivitis. A professional cleaning can also be done during pregnancy, based on your dentist's assessment.
Does flossing create gaps between teeth?
+
No. Used correctly, floss does not push teeth apart. Sometimes, when inflamed gums shrink back to normal with good hygiene, the spaces look slightly bigger, but that is the gum returning to health. If you notice teeth actually moving apart, get an assessment, as there may be another cause.
Where can I get a cleaning and flossing guidance in Mooca?
+
In Mooca, Dr. Cléo Salustiano (CRO-SP 170844) sees patients at Rua Hipódromo, 1141, near Bresser-Mooca station, Monday to Sunday, from 8 a.m. to 10 p.m., including holidays. During the visit she checks your gums and shows you the floss and interdental brush technique for your mouth. Appointments via WhatsApp (11) 97409-7834, in Portuguese, English or Spanish.
