question: Why does orange juice taste so terrible after brushing teeth?
comment: Tooth paste contains a surfactant (usually cleaning agent/chemical) called sodium lauryl sulphate or ether sulphate. The purpose of a surfactant is to reduce surface tension of something in a liquid phase to allow better wetting properties. An unfortunate side effect of this, is SLS inhibits some of your sweetness receptors in your tastebuds hence the bitter taste. The bitter taste is primarily from the acids in a juice.
passages: After using toothpaste, orange juice and other juices have an unpleasant taste. Sodium lauryl sulfate alters taste perception. It can break down phospholipids that inhibit taste receptors for sweetness, giving food a bitter taste. In contrast, apples are known to taste more pleasant after using toothpaste. Distinguishing between the hypotheses that the bitter taste of orange juice results from stannous fluoride or from sodium lauryl sulfate is still an unresolved issue and it is thought that the menthol added for flavor may also take part in the alteration of taste perception when binding to lingual cold receptors.
  
  Section::::Safety.:Whitening toothpastes.
   Malonic acid is a naturally occurring substance found in some fruits. In citrus, fruits produced in organic farming contain higher levels of malonic acid than fruits produced in conventional agriculture.
  
  Section::::Applications.
   In Japan, many yogurts and beverages include added enlarged citrus juice vesicles. These vesicles combined with enzymes are removed from fruit. This results from the heat of the enzymes. When eaten, teeth break the vesicles and provide a fresh squirt of citrus juice to the beverage or yogurt which can create a pleasurable drinking or eating experience.
   Section::::Uses.
  
  Section::::Uses.:Culinary.
   Section::::Temporal taste perception.:Variability of human taste perception.
   In 2007, Dentyl pH released Icy-Fresh Mint and Icy-Fresh Cherry flavours to be sold alongside the original Smooth Mint flavoured mouthwash. In July 2007, the brand was bought by Blistex Inc.
  
  A new flavour, Minty Citrus Splash, was launched in 2008, the first flavour of its kind in the market.
  
  In 2009, Dentyl pH developed Ultra Cleanse, which contains Bicarbonate of Soda to help neutralise plaque acid and further minimise buildup of plaque.
   The ingredients in the Australian and New Zealand cinnamon product are sorbitol, flavor, anticaking agent (470), sweeteners (955, 950) and colours (129, 133); while the orange product contains food acid (330), sweetener (951) (instead of 950), and colours (102, 129) (instead of 129, 133). The orange product advises that it contains Phenylalanine.
   "Does Your Chewing Gum..." has been a popular song on the Dr. Demento Show, appearing 54 times between the show's premiere and 2006 and selected for the "Dr. Demento 20th Anniversary Collection" double CD.
  
  In Ken Kesey's novel "One Flew Over the Cuckoo's Nest", the character Randle Patrick McMurphy also sings a few lines of this song when he realizes the Chief is storing used gum under his bed.
   Section::::Media.
  
  Section::::Media.:Manga.
   Chewy and sticky foods (such as candy, cookies, potato chips, and crackers) tend to adhere to teeth longer. However, dried fruits such as raisins and fresh fruit such as apples and bananas disappear from the mouth quickly, and do not appear to be a risk factor. Consumers are not good at guessing which foods stick around in the mouth.
   Section::::Care.:Effervescent cleansers.
   Fruit juices generally contain lower amounts of sugar than carbonated sugar sweetened beverages. The acidity levels found in fruit juices vary, with citrus based juices having the lowest pH levels. The low acidity found in fruit juices cause higher risk of cavities with enamel exposure.
   A few substances alter the way sweet taste is perceived. One class of these inhibits the perception of sweet tastes, whether from sugars or from highly potent sweeteners. Commercially, the most important of these is lactisole, a compound produced by Domino Sugar. It is used in some jellies and other fruit preserves to bring out their fruit flavors by suppressing their otherwise strong sweetness.
   One common component of flavor packs is ethyl butyrate, a natural aroma that people associate with freshness, and which is removed from juice during pasteurization and storage. "Cooks Illustrated" sent juice samples to independent laboratories, and found that while fresh-squeezed juice naturally contained about 1.19 milligrams of ethyl butyrate per liter, juice that had been commercially processed had levels as high as 8.53 milligrams per liter.
  
  Section::::Commercial orange juice and concentrate.:Canned orange juice.
   Section::::Safety.:Miscellaneous issues and debates.:Alteration of taste perception.
   BULLET::::- Mango Carrot Mix (Banana, Mango, Apple, Lemon, Carrot) with some apple pulp
  
  BULLET::::- Acai Banana Mix (Apple, Banana, Grape, Lemon, Peach) with some apple and acai pulp
  
  BULLET::::- Minute Maid Otona no Zeitaku Ringo - 100% apple juice with carbonate and flavor.
  
  BULLET::::- Minute Maid Morning Fruit
  
  BULLET::::- Cassis and Grape
  
  BULLET::::- Pink Grapefruit Blend (Grapefruit, Apple, Grape)
  
  BULLET::::- Orange Blend (Orange, Grape, Apple, Mandarin Orange, Lemon)
  
  BULLET::::- Healthy Formula Acai Mix (Grape, Cassis, Blueberry, Acai extract)
  
  BULLET::::- Healthy Formula Pomegranate Mix (Apple, Pomegranate, Grapefruit, Cranberry)
  
  BULLET::::- Minute Maid Orange 100%
  
  BULLET::::- Minute Maid Pink Grapefruit 100%
   Sucrose is used by Streptococcus mutans bacteria to produce biofilm. The sucrose is split by glucansucrase, which allows the bacteria to use the resulting glucose for building glucan polymer film and the resulting fructose as fuel to be converted to lactic acid.
  
  Acids contained in fruit juice, vinegar and soft drinks lower the pH level of the oral cavity which causes the enamel to demineralize. Drinking drinks such as orange juice or cola throughout the day raises the risk of dental cavities tremendously.
   A large number of soda pops are acidic as are many fruits, sauces and other foods. Drinking acidic drinks over a long period and continuous sipping may erode the tooth enamel. A 2007 study determined that some flavored sparkling waters are as erosive or more so than orange juice.
   Section::::Variations.:Marmalade.
  
  Marmalade is a fruit preserve made from the juice and peel of citrus fruits boiled with sugar and water. It can be produced from lemons, limes, grapefruits, mandarins, sweet oranges, bergamots and other citrus fruits, or any combination thereof. Marmalade is generally distinguished from jam by its fruit peel.
  
  The benchmark citrus fruit for marmalade production in Britain is the Spanish Seville orange, "Citrus aurantium" var. "aurantium", prized for its high pectin content, which gives a good set. The peel has a distinctive bitter taste which it imparts to the preserve. In America, marmalade is sweet.
  
  Section::::Production.
   Citrus juices contain flavonoids (especially in the pulp) that may have health benefits. Orange juice is also a source of the antioxidant hesperidin. Because of its citric acid content, orange juice is acidic, with a typical pH of around 3.5.
  
  Section::::Commercial orange juice and concentrate.
  
  Section::::Commercial orange juice and concentrate.:Frozen concentrated orange juice.
   BULLET::::- "Dalbergia sissoo", also called "sheesham" in the Indian subcontinent
  
  BULLET::::- Liquorice
  
  BULLET::::- "Gouania lupuloides"
  
  BULLET::::- Cinnamon
  
  BULLET::::- Dogwood
  
  BULLET::::- Olive
  
  BULLET::::- Walnut
  
  BULLET::::- "Acacia catechu"
  
  BULLET::::- "Acacia nilotica"
  
  BULLET::::- and other trees with bitter roots.
  
  United Kingdom, Europe and United States
  
  BULLET::::- Apple
  
  BULLET::::- Pear
  
  BULLET::::- Bamboo
  
  BULLET::::- Fig tree
  
  BULLET::::- Hazelnut
  
  BULLET::::- Oak
  
  BULLET::::- Willow
  
  BULLET::::- Orange
  
  BULLET::::- Lime
  
  BULLET::::- Silver birch
  
  BULLET::::- Olive
  
  BULLET::::- Walnut
  
  BULLET::::- Bay leaf
  
  BULLET::::- Liquorice root
  
  Australia
  
  BULLET::::- Mango
  
  BULLET::::- Mangosteen
  
  India
  
  BULLET::::- Peepal tree
  
  BULLET::::- Indian plum or ber fruit tree
  
  BULLET::::- Java plum or jamun tree
  
  BULLET::::- Safed babul
   BULLET::::- oranges, 0.5–3.5%
  
  BULLET::::- carrots 1.4%
  
  BULLET::::- citrus peels, 30%
  
  The main raw materials for pectin production are dried citrus peels or apple pomace, both by-products of juice production. Pomace from sugar beets is also used to a small extent.
   Foods high in refined carbohydrates, such as concentrated fruit snack bars, sweets, muesli bars, sweet biscuits, some breakfast cereals and sugary drinks including juices can contribute to dental decay, especially if eaten often and over long periods as the sugar nourishes the cariogenic bacteria in mouth. The bacteria produce acid, which destroys teeth. Highly refined packaged foods such as savory crackers and chips can also have high levels of carbohydrates. It is important to check the nutritional information panel on packaged foods to determine which foods and drinks have high carbohydrate concentrations.
   BULLET::::- Macetera: grown in Spain, it is known for its unique flavor
  
  BULLET::::- Malta: grown in Pakistan
  
  BULLET::::- Maltaise Blonde: grown in north Africa
  
  BULLET::::- Maltaise Ovale: grown in South Africa and in California under the names of Garey's or California Mediterranean Sweet
  
  BULLET::::- Marrs: grown in Texas, California and Iran, it is relatively low in acid
  
  BULLET::::- Medan: grown in Medan, Indonesia
   Acid erosion is defined as the loss of tooth enamel caused by acid attack. When consuming carbonated sugar sweetened beverages, acid deposits on the teeth, attacking the enamel. Over a gradual period, the enamel is worn down, which can lead to dental caries. Erosion of tooth enamel begins at a pH of 5.5, and ingredients found in sugar sweetened beverages such as phosphoric acid and citric acid significantly contribute to the demineralization of the enamel. Citric acid in various sugar sweetened beverages can cause chelation.
  