What Mouthwash Does, and What It Does Not

Mouthwash is optional. It is a useful addition for some specific problems and a pleasant habit for everyone else, but it cannot remove plaque, and no rinse substitutes for brushing and cleaning between your teeth.

The distinction that matters is what is in the bottle. A fluoride rinse strengthens enamel. An antiseptic rinse targets bacteria. A cosmetic rinse mainly makes your breath smell of mint for twenty minutes. They are sold on the same shelf and they do different jobs.

A rinse cannot remove plaque, because plaque is stuck on

Plaque is a sticky biofilm that adheres to the tooth surface. Liquid flows over it rather than lifting it off, which is why swishing has never been an alternative to brushing, however thorough it feels. The bacteria on the surface of the film are affected by an antibacterial rinse, the ones underneath are largely shielded.

That is the reason dentists talk about rinses as an addition rather than a replacement. If you have twenty seconds and a choice between mouthwash and an interdental brush, use the interdental brush.

• It cannot lift plaque off a tooth surface
• It cannot clean the surfaces where two teeth touch
• It can carry fluoride onto enamel between brushings
• It can reduce bacteria on the outside of the plaque film
• It can freshen breath for a short while, which is not the same as fixing it

Fluoride rinses are the ones that help ordinary teeth

A daily fluoride rinse puts an extra dose of fluoride on the enamel between brushings, which helps repair the surface after acid attacks. It is genuinely useful for people at higher risk of decay: anyone with a dry mouth, exposed root surfaces, braces, a history of frequent cavities, or a lot of snacking and sipping through the day.

Use it at a separate time from brushing, for example after lunch, so it is an extra dose rather than something that washes the toothpaste fluoride away. Spit it out and avoid eating or drinking for about half an hour afterward.

Prices vary, but a large bottle of fluoride rinse commonly runs somewhere around 5 to 12 dollars and lasts weeks. It is one of the cheaper things in dentistry, which is worth knowing if a dentist has flagged early decay and you are trying to change the trajectory.

Antiseptic rinses are treatments, not daily habits

Chlorhexidine is the strongest commonly prescribed antiseptic rinse. It is used for short courses, after surgery, during an acute gum infection, or when someone cannot brush an area properly for a while. It works well, and it is not meant for long term use.

The reason is that it stains teeth and tongue brown with continued use, alters taste, and can irritate tissue. The staining is removable by a hygienist but it is a nuisance. Use it for exactly as long as you were told, and no longer. It is also inactivated by toothpaste, so leave a gap of at least half an hour between brushing and rinsing with it.

Over the counter antiseptic rinses containing essential oils or cetylpyridinium chloride are milder and can reduce plaque and gingivitis modestly when used alongside brushing. They are a reasonable extra for someone whose gums bleed, but they do not fix the cause, which is the plaque you are not reaching.

The alcohol question, and when a rinse works against you

Alcohol in mouthwash is largely there as a solvent and preservative, not as the active ingredient. For most people it is simply a stinging sensation. For anyone with a dry mouth, mouth ulcers, sore gums or recent surgery, it makes things worse, and alcohol free versions of nearly everything exist.

Alcohol free is also the sensible choice for children old enough to use a rinse at all, and for anyone in recovery from alcohol dependence. Rinses are generally not recommended for young children who may swallow them.

The most common way a rinse backfires is timing. Rinsing right after brushing washes away the concentrated fluoride from your toothpaste and replaces it with something weaker.

• Do not use mouthwash immediately after brushing, pick another time of day
• Choose alcohol free if your mouth is dry, sore or ulcerated
• Do not use chlorhexidine long term, it stains teeth and alters taste
• Check the label for a fluoride content if decay is your concern
• Never let a rinse cover up bleeding gums or persistent bad breath

Using a rinse to hide a symptom is the real risk

Bad breath and bleeding gums are the two reasons people reach for mouthwash, and they are also the two things a mouthwash is worst at solving. Both are usually signs of something happening in the mouth, gum inflammation, an untreated cavity, an old failing filling, a dry mouth or something further down, and a mint rinse buys twenty minutes of cover while the cause continues.

If either has been going on for more than a couple of weeks, get it looked at rather than deodorized. The directory searches every dental practice in the United States by town or ZIP code and shows the closest first, free and with no account. Say on the phone what you have noticed and how long it has been going on.

So do you need mouthwash at all

If your gums are healthy, you brush twice a day with fluoride toothpaste and you clean between your teeth daily, a rinse adds very little. Skip it without guilt, and spend the money on brush heads or interdental brushes.

If you have a specific reason, a dry mouth, braces, gum disease under treatment, exposed roots, a recent extraction or a run of cavities, then the right rinse used at the right time is a cheap and worthwhile addition. Ask your dentist which type and when, because the answer for gum inflammation and the answer for decay are different bottles.

Frequently asked

This is general information to help you ask better questions, not a diagnosis. Anything happening in your own mouth needs a dentist who can look at it.