Prevention, Hygiene & Lifestyle
Bad breath (halitosis)
Lasting bad breath usually starts in the mouth and can be improved.
Common cause
Oral bacteria
Helps most
Daily cleaning
Also affects
Dry mouth
If it lasts
See your dentist
Overview
Most bad breath comes from bacteria on the tongue, between the teeth and around the gums. A dry mouth, certain foods and smoking can make it worse.
Good daily cleaning solves most cases. If it persists, your dentist can look for a cause such as gum disease or a hidden infection.
What to know
- Most cases start in the mouth
- Cleaning the tongue and between teeth helps
- A dry mouth can make it worse
- Lasting bad breath is worth checking
Common questions
Why can I not smell my own breath?
We get used to our own smell. A trusted person or your dentist can help judge it.
Will mouthwash fix it?
It can freshen breath briefly, but it does not replace cleaning the cause away.
Should I clean my tongue?
Yes. Gently cleaning the back of the tongue removes a common source of odour.
Could it be a health problem?
Sometimes. If cleaning does not help, your dentist or doctor can check further.
Related topics
Brushing technique
Brushing twice a day removes the plaque that causes decay and gum disease.
Flossing & interdental cleaning
Cleaning between your teeth each day reaches the spots a brush cannot.
Mouthrinses
Mouthrinses can support your routine but do not replace brushing and flossing.
Gum disease (periodontitis)
A bacterial infection of the gums and bone that support your teeth.
Dr Rick Iskandar · Reviewed June 2026