Wikipedia:
From article: "Teeth Cleaning"
From article "Tongue cleaning"Almost all cavities occur where food is trapped between teeth and inside deep pits and fissures in grooves on chewing surfaces, where the brush, toothpaste, mouthwash, saliva, and chewing gum cannot reach.
The bacteria and fungi that grow on the tongue are related to many common oral care and general health problems. In addition, decaying bacteria produce volatile sulphur compounds on the rear of the tongue, these molecules account for 80 to 90 percent of all cases of halitosis (bad breath).
Tongue cleaning is meant to remove some of the millions of bacteria (up to 500 different types, decaying food debris, fungi (such as Candida), and dead cells, from the surface of the rear of the tongue. Tongue cleaning is generally viewed as the solution for most cases of halitosis, or bad breath. Scientific studies have shown tongue bacteria produce malodorous compounds and fatty acids, and account for 80 to 90 percent of all cases of bad breath. Research shows that only the rest of about 5-20% of cases originate in the stomach, from the tonsils, from decaying food stuck between the teeth, gum disease, tooth decay, or plaque accumulated on the teeth. Clinical studies have shown that using tongue cleaners on a daily basis has a significant effect on eliminating anaerobic bacteria and decreasing oral malodor.
Tongue bacteria produce malodorous compounds and fatty acids, and account for 80 to 90 percent of all cases of bad breath. These microorganisms colonize and multiply on the protein-rich areas of the tongue, and eventually, through the saliva, reach all areas of the mouth including the teeth and gums. These bacteria are considerable contributors to periodontal problems, plaque on the teeth, tooth decay, gum infections, gum recession and even tooth loss.
Cleaning the tongue with an appropriately designed tongue cleaner also massages the tongue. This is an important element of traditional Chinese medicine where the tongue surface is identified as an important reflexogenic zone.
Tongue cleaning improves the sense of taste (because of cleaning the taste buds) and also stimulates the secretions of digestive enzymes.
n the past several years, dental professionals (dentists and hygienists) have emphasized the importance of tongue cleaning as a way to maintain a high level of oral hygiene. In addition, physicians have rediscovered the link between oral health and pathologies of the rest of the body, one which was prevalent in the medical field in the early part of the 20th century. Breath specialists generally agree that the majority of cases of halitosis (bad breath) come from the rear of the tongue, an area that can be cleaned efficiently by using an ergonomically designed tongue cleaner



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