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A dental consonant is a consonant articulated with the tongue against the upper teeth, such as /θ/, /ð/.In some languages, dentals are distinguished from other groups, such as alveolar consonants, in which the tongue contacts the gum ridge.
The voiceless dental non-sibilant fricative is a type of consonantal sound used in some spoken languages.It is familiar to most English speakers as the 'th' in think.Though rather rare as a phoneme among the world's languages, it is encountered in some of the most widespread and influential ones.
A voiceless postalveolar fricative is a type of consonantal sound used in some spoken languages.The International Phonetic Association uses the term voiceless postalveolar fricative only for the sound [ ʃ ], [1] but it also describes the voiceless postalveolar non-sibilant fricative [ɹ̠̊˔], for which there are significant perceptual differences.
The forward place of articulation is typically dental (or denti-alveolar) and laminal, which means it is articulated with the tip of the tongue against the alveolar ridge or the upper teeth, but depending on the language may be interdental or even apical. The release is a noisy, affricate-like sound.
Its place of articulation is labiodental, which means it is articulated with the lower lip and the upper teeth. Its phonation is voiced, which means the vocal cords vibrate during the articulation. It is a nasal consonant, which means air is allowed to escape through the nose, either exclusively ( nasal stops ) or in addition to through the mouth.
A 1930s poster from the Work Projects Administration promoting oral hygiene. Tooth decay is the most common global disease. [14] Over 80% of cavities occur inside fissures in teeth where brushing cannot reach food left trapped after eating and saliva and fluoride have no access to neutralize acid and remineralize demineralized teeth, unlike easy-to-clean parts of the tooth, where fewer ...
The miswak is a teeth-cleaning twig made from the Salvadora persica tree. The miswak's properties have been described thus: "Apart from their antibacterial activity which may help control the formation and activity of dental plaque, they can be used effectively as a natural toothbrush for teeth cleaning.
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