In the US , 80 million people suffer from chronic halitosis. That is 25% of the population.
Halitosis is the third most frequent reason people seek dental care after tooth decay and gum disease.
It is perceived as a social taboo that can sometimes trigger social anxiety and depression.
Periodontal (gum) disease often causes severe bad breath , it is caused by plaque , a film of bacteria that bonds to your teeth.
Dry Mouth or xerostomia takes the third place , due to decreased salivary flow it can be caused by medication as a side effect such as anti-depressants and over 400 medications.
Other non-prevalent causes are faulty dental work, food impactation areas, abscesses, unclean dentures, hpv.
Bad breath may also be a sign that you have a serious health problem such as tonsilloliths, respiratory tract infection ,chronic sinusitis , post- nasal drip , bronchitis , diabetes, kidney or liver failure ( fetor hepaticus) , rheumatic fever, lung abscess,blood dycrasias, cirrosis, uremia, HAND-SHULLER -CHRISTIAN disease, scurvy,Wegner's granulomatosis, diphtheria , syphilis , Zenkers Syndrome, disorders of nasal cavity, throat infection , trimethylaminuria ,lung infection, gastroesophageal reflux.
Bad breath can also be caused by medication you are taking such as anti-depressants and over 400 medications cause dry mouth and halitosis.
Everyone should have a tongue scraper even without halitosis, since the tongue is the most dirty organ in the entire body. It removes food and also the white coating that triggers halitosis bacteria.
A toothbrush should never be used in place of a tongue scraper because then the bacteria caught over the tongue will be disseminated into the gingival crevices ( gums) and teeth , plus it stimulates the overgrowth of the taste buds making the tongue even more retentive for the white coating to bond.