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Why do braces cause bad breath?

Written by Adèle & Dvir · 6 sources cited · Updated October 19, 2026

Quick answer

Braces do not cause bad breath by themselves, but brackets and wires trap food and plaque in places that are hard to clean, and that plaque can lead to swollen gums and odor. A 2019 systematic review found no solid evidence that fixed braces cause bad breath when people keep their teeth clean. A routine that cleans around every bracket, between teeth and across your tongue keeps braces breath away.

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What the research says about braces and bad breath

It is a common worry, but the evidence is more reassuring than you might expect. A 2019 systematic review in BMC Oral Health looked for trials on fixed braces and bad breath and concluded there is a lack of scientific evidence that people with fixed appliances develop bad breath during treatment, although the studies were few and of low quality. A study of dental students found braces did not change measured sulfur gas levels, though wearers were more likely to think their breath was bad.

The real issue is plaque. A 2022 review notes that braces interfere with brushing and encourage plaque buildup, which shifts mouth bacteria and can lead to gum inflammation, white spots on teeth, decay and bad breath. In other words, braces make bad breath easier to get, not inevitable.

Where food and plaque hide with braces

  • Around and under brackets, especially near the gumline.
  • Under the archwire, between brackets.
  • Between teeth, where floss is harder to thread.
  • Around bands on back molars.
  • On your tongue, which collects coating whether or not you wear braces.

MouthHealthy notes that eating too many sugary foods with braces leads to plaque buildup around the brackets that can stain or damage teeth.

A cleaning routine for braces breath

  1. Brush twice a day with fluoride toothpaste, morning and last thing at night, angling the brush above and below each bracket. The NHS also advises cleaning carefully around the brace.
  2. Clean between teeth and under the wire every day. Interdental brushes, floss threaders or orthodontic floss make this easier.
  3. Consider a water flosser to flush food from around brackets, as an extra rather than a replacement for brushing.
  4. Clean your tongue once a day. It takes seconds and removes the coating that holds odor bacteria.
  5. Rinse with water after meals if you cannot brush straight away.
  6. Limit sugary and sticky foods, and avoid hard, crunchy foods that can break brackets, as the NHS suggests.
  7. Keep your dental checkups during orthodontic treatment, not just your orthodontist visits.

Clear aligners and retainers

Aligners and retainers can smell too, because plaque and saliva dry onto them. Cleveland Clinic advises cleaning retainers as your dentist directs. In practice that means rinsing them whenever you take them out, brushing them gently, brushing your own teeth before putting them back in, and only drinking water while wearing aligners. Follow your orthodontist's instructions for soaking or cleaning products, since some can damage the plastic.

Braces breath vs gum problems

SignLikely causeWhat to do
Odor after meals that clears with brushingTrapped foodClean after eating
Puffy gums that bleed around bracketsGingivitis from plaqueStep up cleaning, tell your orthodontist or dentist
White chalky spots near bracketsEarly enamel damageTell your dentist; better plaque control and fluoride
Coating on the back of the tongueTongue bacteriaDaily tongue cleaning

The NHS says to contact your orthodontist if your gums are very red, swollen or painful, or your braces are broken.

Frequently asked questions

Related guides

Sources

  1. Do fixed orthodontic appliances cause halitosis? A systematic review (BMC Oral Health (via PubMed, NIH))
  2. Oral microbiota changes during orthodontic treatment (Frontiers in Bioscience (via PubMed, NIH))
  3. Effect of fixed orthodontic appliances on self-assessment and diagnosis of halitosis in undergraduate dental students (Journal of Indian Society of Periodontology (via PubMed, NIH))
  4. Braces (NHS)
  5. Braces (MouthHealthy (American Dental Association))
  6. Bad Breath (Halitosis) (Cleveland Clinic)