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Mouthwash | side effects of using mouthwash

Disadvantages mouthwash: imbalance of the oral flora, drought, spots. Discover alternatives like natural mouthwash: the ozone spray, effective against gingivitis.

This article was written by the Hygiène Précision team, based on scientific data and rigorous clinical studies. Updated on 03/10/2026

3/2/20266 min read

Mouthwashes are widely used as a complement to daily oral hygiene. They offer an immediate feeling of freshness and promise to combat bad breath, bacteria, or inflammation. However, the downside of mouthwash is often underestimated. When used incorrectly or chosen indiscriminately, mouthwashes can do more harm than good.

In this article, we explore in depth the disadvantages of mouthwashes, comparing them to gentler solutions such as natural mouthwash or innovative alternatives, such as the ozone oral irrigator, which is particularly effective against gingivitis.

This article contains the following:

Mouthwash side effects

Although mouthwash can be a valuable addition to your oral hygiene routine, it is not without risks. Depending on its ingredients and how often it is used, a mouthwash may cause unwanted side effects, particularly when used daily or without professional advice. Understanding these potential drawbacks can help you choose the right product and use it safely alongside regular brushing and flossing.

1. Imbalance of the oral flora

One of the major drawbacks of mouthwashes lies in their non-selective action on bacteria. Powerful antiseptic products, such as those containing chlorhexidine, eliminate not only harmful bacteria, but also the beneficial bacteria essential to the oral flora.

Risk: A microbial imbalance can promote the proliferation of resistant pathogenic bacteria, increasing the risk of superinfections and chronic irritations.

2. Tooth and tongue discoloration

Prolonged use of certain mouthwashes can lead to undesirable cosmetic effects:

Brown stains on teeth
Tongue staining
Temporary alteration of taste

These effects are particularly observed with mouthwashes containing chlorhexidine or certain artificial dyes.

3. Dry mouth

Another drawback of mouthwash, especially alcohol -based ones, is the drying effect. This can:

Reduce saliva production
Increase the risk of cavities
Promoting gum diseases such as gingivitis

A dry mouth becomes a favorable environment for bacteria and fungi.

4. False sense of security

The fresh taste and the feeling of cleanliness should not make us forget the essentials: mechanical brushing remains indispensable. Too often, regular use of mouthwash masks the symptoms of an underlying problem (such as incipient gingivitis) and delays seeking dental care.

5. Drug interactions and allergens

Some components may interact with medical treatments (asthma, heart disease, etc.) or cause allergic reactions. It is crucial to consult a professional before using a mouthwash daily, especially in the presence of medical conditions.

Mouthwash side effects blood pressure

Some people wonder whether mouthwash can affect blood pressure, especially when using antiseptic formulas on a daily basis. Current research suggests that certain antibacterial mouthwashes may temporarily reduce the beneficial oral bacteria involved in the production of nitric oxide, a molecule that helps regulate blood vessel function. While a few studies have observed small increases in blood pressure associated with frequent use of strong antiseptic mouthwashes, the evidence remains limited and does not establish a direct cause-and-effect relationship. For most healthy adults, using a mouthwash as directed is unlikely to have a significant impact on blood pressure. However, individuals with hypertension or cardiovascular conditions should choose gentle, alcohol-free formulations for routine use and consult their healthcare professional if they have concerns about the most suitable oral care products.

When should you avoid using mouthwash?

Although mouthwash can be a valuable addition to your daily oral hygiene routine, there are situations where it is best avoided or chosen with extra care. Using the wrong formula may worsen existing oral conditions or cause unnecessary discomfort. Before incorporating a mouthwash into your routine, consider the following precautions. You should avoid using mouthwash in case of In case of dry mouth, During orthodontic treatment...

In case of dry mouth

If you suffer from dry mouth (xerostomia), avoid mouthwashes that contain alcohol. Alcohol-based formulas can further reduce moisture in the mouth, increasing discomfort and the risk of cavities. Instead, choose an alcohol-free mouthwash specifically designed to soothe and hydrate oral tissues.

During orthodontic treatment

People wearing braces or other orthodontic appliances should be cautious when selecting a mouthwash. Some active ingredients may irritate sensitive gums or affect orthodontic adhesives. Your dentist or orthodontist can recommend a formula that is both safe and effective for your treatment.

In case of known allergies

Do not use a mouthwash if you are allergic to any of its ingredients, such as certain antiseptic agents, preservatives, or artificial fragrances. If you experience burning, swelling, or irritation after use, discontinue the product immediately and seek advice from a dental professional.

Natural alternatives to chemical mouthwashes

Many people are looking for alternatives to conventional mouthwashes because some formulas containing alcohol or strong antiseptics can disrupt the natural balance of the oral microbiome when used too frequently. Choosing a natural mouthwash can help support daily oral hygiene while being gentler on the gums and oral tissues. Combined with regular brushing, flossing, and routine dental check-ups, natural solutions can contribute to maintaining fresh breath and healthy gums.

Natural mouthwash: a gentle and effective option

A natural mouthwash may contain ingredients such as:

Ozone
Baking soda
Tea tree essential oil
Aloe vera
Warm salt water

These natural solutions better respect the balance of the mouth, while offering a gentle antiseptic action, particularly against gingivitis. However, they should complement, not replace, good oral hygiene practices and professional dental care when needed. Selecting high-quality natural ingredients and using them correctly can provide a soothing, refreshing alternative for everyday oral care.

Natural alternative to mouthwash: ozone products

Faced with the limitations of chemical and mechanical methods, ozone stands out as the most effective natural health solution for disinfection.

Ozone: a powerful yet 100% environmentally friendly biocide

Ozone (O3) is a natural gas with exceptional oxidizing properties. Unlike chemicals, it eliminates viruses, fungi, and anaerobic bacteria without leaving toxic residues or inducing bacterial resistance. It promotes tissue healing and remineralization.

Aquolab and Ozone technology for the benefit of individuals

The Aquolab system transforms water into a powerful disinfectant thanks to ozone. By combining a low-pressure pulsed water jet (to avoid injury) and the properties of ozone, it breaks down dental biofilm while respecting the protective oral flora.

Natural unlimited mouthwash: The ozone water flosser

Among the most effective and oral health-friendly alternatives, the Aquolab ozone water flosser, recommended by dentists, stands out:

Ozone is a powerful and non-aggressive natural disinfectant.
It eliminates bacteria, and the bacteria responsible for periodontal diseases without disrupting the oral flora.
It is ideal for sensitive or irritated gums.

The Aquolab water jet combines effectiveness, gentleness and safety for optimal daily hygiene.

A study has shown that, compared to chlorhexidine (an ingredient found in mouthwashes), ozonated water offers several advantages: superior clinical efficacy, no side effects (no tooth staining or taste alteration), better patient adherence to treatment, and improved gum tissue health due to enhanced vascularization. Furthermore, when ozone is delivered via a water flosser, it combines mechanical and antimicrobial action, which is particularly beneficial around orthodontic braces.

In conclusion, ozonated water appears to be a more comfortable, better tolerated, and more effective alternative to chlorhexidine for periodontal hygiene. Sources: 2017_11_Presentazione Poster_Congresso SIOI__Pisa_Dr. Cosola_UNI PISA , A short-term study of the effects of ozone irrigation in an orthodontic population with fixed appliances .

Ozone water flosser as a natural mouthwash

How to use mouthwash safely?

Using mouthwash correctly can help improve your daily oral hygiene routine, but it should always be used with care. The right product, combined with good brushing habits and regular dental check-ups, can help maintain healthy teeth and gums while reducing the risk of irritation or unnecessary exposure to harsh ingredients.

Choose a product suited to your needs

For everyday use, select a mouthwash that is gentle on the mouth. Alcohol-free, colour-free, and chlorhexidine-free formulas are generally preferred for long-term daily use, as they help freshen breath and support oral hygiene without unnecessarily irritating sensitive tissues.

Do not replace brushing with mouthwash

Mouthwash should never replace brushing and flossing. Instead, it works as a complementary step in your oral care routine by reaching areas that brushing may miss and helping to maintain a clean, fresh feeling after brushing.

Limit the frequency of use

Follow the manufacturer's instructions or your dentist's recommendations. In most cases, using mouthwash once or twice a day is sufficient. Excessive use may disturb the natural balance of the oral microbiome or cause discomfort, depending on the formula.

Consult a dentist if symptoms persist

If you experience recurring tooth pain, bleeding gums, persistent bad breath, or signs of gingivitis, seek professional dental advice rather than relying on mouthwash alone. A dentist can identify the underlying cause and recommend the most appropriate treatment to protect your long-term oral health.

Mouthwash conclusion

Using mouthwash may seem harmless, but the drawbacks of mouthwash are real when used incorrectly. It's better to opt for natural products or gentler alternatives like an ozone water flosser, which is particularly effective against inflammations such as gingivitis.

For optimal oral hygiene, prioritize:

Regular brushing with good technique
The use of dental floss or interdental brushes
A gentle and effective complement, such as a natural mouthwash or the Aquolab water flosser.