Causes of bad breath

1. Oral hygiene problem

• Bad oral hygiene accompanied by putrefied food debris

• Failed to thoroughly clean the denture, leaving food debris and plaque on the denture which cause bad breath.

2. Oral Diseases or Oral Problems

• Oral Diseases such as ：
• Dental Caries —if dental caries has extended into the pulp, the necrotic pulp will emit foul odour.
• Periodontal Disease —the accumulation of dental plaque and calculus irritates the gum, which leads to periodontal disease and causes bad breath.
• Oral Problem:
• Insufficient saliva secretion (dry mouth)—if saliva secretion is insufficient, the oral cleaning effect of saliva will be reduced.

3. General health problems such as ：

• Respiratory system problems
• Allergic Rhinitis (nose allergy)
• Sinusitis (infection of sinus)
• Alimentary tract problem (digestive system)
• Digestive problem
• Diabetes
• Nasopharyngeal Cancer (cancer of the nose and throat)

4. Smoking  

Reference information: http://www.toothclub.gov.hk/

It is not intended as medical advice to any specific person. If you have any need for personal advice or have any questions regarding your health, please consult your Dentist for diagnosis and treatment.