Gum problem guide

5 min read

Bad breath

Bad breath is common and often improves with mouth cleaning, but persistent bad breath, bleeding gums or a bad taste should be checked.

Bad breath can be temporary after food, drink, smoking or dry mouth. It can also be linked with plaque, gum inflammation, tooth decay, infection, dentures or wider health factors.

Persistent bad breath should not be dismissed, especially with bleeding gums, swelling, tooth pain, a bad taste or dry mouth. A dentist can assess oral causes.

At a glance

Check common triggers

Temporary causes

Food, smoking, alcohol, dehydration and dry mouth can contribute.
Clean teeth, gums, tongue and dentures carefully.
Notice whether bad breath persists despite routine cleaning.

Book dental advice

Persistent symptoms

Contact a dentist if bad breath continues or comes with bleeding gums.
Seek review if there is a bad taste, tooth pain, swelling or loose teeth.
Dry mouth may increase dental risk and may need assessment.

Urgent signs

Prompt help

Urgent dental care is needed if bad breath is linked with swelling, fever, pus or severe pain.
Call 999 or go to A&E for severe swelling affecting breathing or swallowing.
Do not delay rapidly worsening facial swelling.

Contents

Bad breath can have oral and non-oral causes

Many cases relate to the mouth, including plaque on teeth or tongue, gum inflammation, dental decay, dry mouth or dentures. Persistent symptoms should be assessed.

Possible causes or contributing factors

Plaque, tongue coating, gum inflammation or gum disease.
Dry mouth, smoking, alcohol, diet or dehydration.
Tooth decay, dental abscess or food trapping.
Dentures, appliances or wider health conditions.

What you can do now

Brush teeth and gums gently twice daily and clean between teeth if you can.
Clean the tongue and any dentures or appliances.
Drink water and arrange dental advice if symptoms persist.

What not to do

Do not rely on mints or mouthwash to hide persistent symptoms.
Do not ignore bleeding gums, swelling, pain or a bad taste.
Do not stop prescribed medicine if dry mouth may be medicine-related; seek medical advice.

When to contact a dentist

Bad breath continues despite routine cleaning.
There is bleeding, swollen gums, tooth pain or a bad taste.
Dentures, crowns, fillings or food trapping may be involved.

When urgent dental care is needed

Bad breath appears with swelling, pus, fever or severe pain.
There is facial swelling or difficulty opening the mouth.
Symptoms suggest a dental or gum abscess.

When to call 999 or go to A&E

What a dentist or relevant professional may assess or do

Assess teeth, gums, tongue, dentures and oral hygiene.
Look for gum disease, decay, infection signs or dry mouth factors.
Provide cleaning advice, treatment or referral based on findings.

Frequently asked questions

Is bad breath usually dental?

It often comes from the mouth, but non-dental factors can contribute. Persistent bad breath should be assessed.

Can gum disease cause bad breath?

Gum inflammation and plaque build-up can contribute to bad breath and a bad taste.

When is bad breath urgent?

Seek urgent dental care if it is linked with swelling, pus, fever, severe pain or difficulty opening the mouth.

Looking for bad breath guidance?

Browse Odenta gum guidance and arrange dental assessment if bad breath is persistent or linked with gum symptoms.

Browse gum problem guides

Official sources

These links open external official guidance pages for further help.

Content reviewed by Dr Majid Saeed · 13 July 2026

References used for this guide are listed above.

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