Almost every second patient in my practice says: «Andrii, I rinse with mouthwash every day, but my gums still bleed». The patient shows me the bottle. Listerine Original, 26.9% alcohol, pink or green. I rinse for 30 seconds after brushing. I tell them: «You are making two mistakes at once». First, a rinse after brushing washes away the fluoride from the paste. Second, this particular product is not for daily use on thin mucosa.
16 years of practice have convinced me: a mouthwash is a tool, not a routine. For 90% of healthy patients, it is unnecessary. If you brush twice a day with the Bass technique plus interdental brushes, a rinse adds nothing. Just an extra step that may even hurt if the wrong product is picked.
But in 10% of cases a rinse is indispensable. After surgery. With active periodontitis. With fixed braces. With xerostomia. Here is how I pick a mouthwash together with the patient, based on DGZMK recommendations and Cochrane reviews.
Chlorhexidine 0.2%: the gold standard. with caveats
CHX at a concentration of 0.1,0.2% is the only mouthwash that dentists call the "gold standard" for chemical plaque control. The DGZMK (German Society of Dentistry) recognises CHX as the most effective antibacterial agent for short-term use.
When CHX is clearly indicated: after oral surgery (first 1,2 weeks), during acute gingivitis, and whenever normal mechanical hygiene is temporarily impossible.
Side effects: why CHX is not for daily use
🟤 Tooth staining. CHX binds to colouring compounds from tea, coffee, and red wine. Brown stains can appear after just 2,3 weeks of daily use.
🦠 Microbiome disruption. It kills not only pathogenic bacteria but also beneficial ones. and can promote Candida overgrowth.
👅 Taste distortion with prolonged use.
Fluoride rinses: for cavity prevention
Rinses containing fluoride (220,450 ppm NaF) strengthen enamel and can help remineralise early-stage cavities. They are especially useful for patients with high caries risk, fixed braces, or dry mouth. After rinsing, do not rinse with water. this washes away the fluoride.
Listerine: the most researched rinse
Backed by more than 150 clinical studies. Its four essential oils disrupt bacterial cell membranes, making it effective for daily gingivitis prevention without staining teeth. The drawback: classic formulas contain 26.9% alcohol. if you have dry mouth, choose an alcohol-free version.
When mouthwash is NOT needed
If your gums are healthy, you have no active cavities, no orthodontic appliances. and you brush twice a day with flossing. a mouthwash adds very little. The most common mistake: rinsing immediately after brushing, which washes away the protective fluoride from your toothpaste.
Quick selection guide
🔴 After surgery, first 2 weeks → CHX 0.2% (Chlorhexamed, Meridol med)
🔵 Cavity prevention, braces → Fluoride rinse (Elmex, Sensodyne Fluoride)
🟢 Daily gingivitis prevention → Listerine (alcohol-free)
💧 Dry mouth → Biotène, Xerodent (alcohol-free)
✅ Healthy mouth, no risk factors → mouthwash not necessary
5 mistakes I see every week
16 years of practice, and here is the ranking of the most common mouthwash mistakes my patients make.
1. Rinsing right after brushing
The most common mistake. Fluoride from the paste gets washed away, remineralisation is zeroed out. Rule: brush, spit, do not rinse. Use mouthwash separately, at least 30 minutes after the paste, or at a different time of day altogether (for example after lunch).
2. Using CHX as a «magic wand»
«My gums hurt, I have been rinsing with CHX for a month, the bleeding is gone». I look at teeth with brown stains and ask: «Did the gums stop bleeding, or did the bacteria stop producing blood because of CHX?» Those are two different things. CHX suppresses bacteria but does not heal gingivitis. The moment you stop, gingivitis comes back. You need mechanical plaque removal, not CHX.
3. Diluting concentrated CHX with water
Some patients buy CHX 0.2% and dilute it with water «so it does not stain so much». That destroys the concentration and makes the rinse ineffective. If you need a milder version, buy a ready-made CHX 0.06% or 0.1% (Meridol med, Curasept ADS).
4. Alcoholic rinse with xerostomia
With dry mouth (diabetes, medications, post-chemotherapy) alcohol dries the mucosa even more. It feels «disinfecting», in reality it accelerates caries and candidiasis. Use only alcohol-free versions (Biotène, Listerine Zero, Xerodent).
5. Replacing brushing with mouthwash
«I did not have time to brush, but I rinsed». A rinse does not mechanically remove biofilm. Biofilm is not water with bacteria, it is a structured film attached to teeth. Only a brush and interdental brushes break it down. Rinsing is a supplement, not a replacement.
How to rinse correctly: 4 steps
Small details that make a big difference.
Step 1. Amount, 10-15 ml
Most mouthwash cap volumes are exactly this. Do not pour «by eye», it will be either too much or too little. Stick precisely to the instructions.
Step 2. Time, 30-60 seconds
30 seconds for Listerine and fluoride rinses. 60 seconds for CHX. Less, and it does not work. More, no extra benefit, sometimes mucosa irritation.
Step 3. Active movement
Rinse vigorously so the liquid reaches between teeth. Do not just hold it in the mouth, «push it» around with tongue and cheeks. Otherwise the rinse never contacts biofilm on contact surfaces.
Step 4. Spit, do not swallow
Especially important for children. Alcohol and fluoride at mouthwash doses are safe when spat out, but regular swallowing can cause fluorosis (spots on teeth) in kids. For adults, swallowing large doses of CHX can disrupt gut microflora.