Mouthwash: when it helps, which kind, and when to skip it

Last checked: November 2026. Written by Clockwork, which is making a mineral mouthwash. This page isn't medical advice.

The short answer

Mouthwash is an extra, not a replacement for brushing and cleaning between your teeth. Some kinds have good evidence for specific jobs: fluoride rinses for people at higher risk of decay, chlorhexidine for short-term gum problems on a dentist's advice, and essential-oil or cetylpyridinium chloride rinses for plaque and gum inflammation alongside brushing. A rinse also reaches places a brush doesn't: the back teeth, the gumline and the tongue.

What a mouthwash can and can't do

  • It can reach the whole mouth in 30 seconds, reduce plaque and gum inflammation when added to brushing (depending on the type), freshen breath, and deliver an active ingredient to surfaces a brush misses.
  • It can't remove the sticky plaque film on its own. Only brushing and cleaning between teeth do that. Fresh breath from a rinse is short-lived if the cause, such as gum disease or tongue coating, isn't dealt with.

The main types, and the evidence

Type Best for Evidence Watch out for
Fluoride rinse Higher decay risk, braces In children and teenagers, supervised fluoride rinsing reduced decay by about 27% (Marinho et al., 2016) Not for young children who may swallow it
Chlorhexidine Short-term gum problems, after dental surgery Reduces plaque and gum inflammation alongside brushing (James et al., 2017) Brown staining and taste changes; usually for a few weeks, on a dentist's advice
Essential oils Plaque and gingivitis, daily Reduces plaque and gingivitis as an add-on to brushing (Araujo et al., 2015) Many contain alcohol, which can sting and dry the mouth
Cetylpyridinium chloride (CPC) Plaque and gingivitis, daily Small but consistent benefit added to brushing (Haps et al., 2008) Can stain with long use
Cosmetic or breath rinses Fresh breath Freshens for a short time No lasting effect on plaque or gums
Mineral rinses with hydroxyapatite Carrying the mineral enamel is made of to the back teeth and gumline Early and mostly laboratory evidence; Europe allows nano-hydroxyapatite in mouthwash up to 0.465% Less studied than fluoride rinses

When mouthwash is worth it

  • You have bleeding or puffy gums and your dentist suggests a rinse alongside better brushing.
  • You wear braces or aligners and plaque builds up around them.
  • You're at higher risk of decay and want an extra fluoride or mineral step.
  • You find it hard to reach the back teeth or clean between teeth.
  • You want a step that reaches the whole mouth, not only the surfaces a brush touches.

When to skip it, or take care

  • Children under six, who are likely to swallow it.
  • Dry mouth. Choose alcohol-free.
  • Straight after a fluoride toothpaste. Rinsing washes away the fluoride left on your teeth. Use the mouthwash at a different time of day.
  • Using it to cover bad breath for weeks. Persistent bad breath needs a dentist.
  • Chlorhexidine for months without your dentist's advice.

How to use mouthwash

  1. Use the amount on the label, usually 10 to 20 ml.
  2. Swish for 30 seconds to a minute, between the teeth and to the back of the mouth.
  3. Spit it out. Don't swallow.
  4. Don't eat or drink for about 30 minutes, so the active stays on your teeth.
  5. If you use a fluoride toothpaste, rinse at a different time from brushing, for example after lunch.

Where Clockwork fits

Clockwork Mineral Mouthwash is coming soon, as N°2 Rinse in our three-step ritual. It carries nanoXIM hydroxyapatite, the mineral in our toothpaste, to the back teeth and gumline after you brush. Because our toothpaste is fluoride-free, rinsing with it doesn't wash a fluoride layer away. It is an extra step, not a replacement for brushing. See Clockwork nHAp toothpaste.

Questions people ask

Is it necessary to use mouthwash?

No. Brushing twice a day with a good toothpaste and cleaning between your teeth matter most. Mouthwash is worth adding for specific reasons, listed above.

Should I use mouthwash before or after brushing?

With a fluoride toothpaste, at a different time of day, so you don't rinse the fluoride away. With a fluoride-free toothpaste, after brushing works, and a mineral rinse adds to it.

Is alcohol-free mouthwash better?

For dry mouth or sensitive gums, yes, because alcohol can sting and dry the mouth. Many effective rinses are alcohol-free.

Can mouthwash cure bad breath?

It masks it for a while. Lasting fresh breath comes from cleaning teeth, gums and tongue, and treating gum disease if you have it.

Sources

  1. Marinho VCC, et al. Fluoride mouthrinses for preventing dental caries in children and adolescents. Cochrane Database Syst Rev 2016;(7):CD002284.
  2. James P, et al. Chlorhexidine mouthrinse as an adjunctive treatment for gingival health. Cochrane Database Syst Rev 2017;(3):CD008676.
  3. Araujo MWB, et al. Meta-analysis of the effect of an essential oil-containing mouthrinse on gingivitis and plaque. J Am Dent Assoc 2015;146(8):610–622.
  4. Haps S, et al. The effect of cetylpyridinium chloride-containing mouth rinses as adjuncts to toothbrushing on plaque and parameters of gingival inflammation: a systematic review. Int J Dent Hyg 2008;6(4):290–303.
  5. SCCS, Opinion on Hydroxyapatite (nano), SCCS/1648/22, 2023.