Salt in Beauty

Salt (sogeum, 소금) holds the Korean pantry together: it cures, ferments and seasons. Its story on the table is told in cheonilyeom and making kimchi. Its role in beauty is a side story, and it needs more care than most.

Bamboo salt: what it is, and what is disputed

Bamboo salt (jukyeom, 죽염) is, according to the Encyclopedia of Korean Culture, sun-dried sea salt packed into bamboo tubes, sealed with yellow clay and roasted over pine wood, repeated eight times and finished with a ninth roasting with pine resin above 1,200 degrees Celsius. The entry is frank about the competing stories behind it. Some accounts trace the method to the legendary Dangun era or to a Buddhist monk, while a rebuttal holds that Kim Il-hoon (1909 to 1992) devised it during the colonial period and popularized it by making it public. Industrial production and wider public recognition began in the mid-1980s. So bamboo salt as a modern product has a fairly clear recent history, and claims of great antiquity are disputed. The entry says it began as a folk remedy and lists toothpaste, soap and cosmetics among its later products.

Teeth and rinses

A Sports Khan series on Joseon history reports that the Donguibogam advises brushing the teeth with salt and rinsing with warm water to clear lingering alcohol. This is a newspaper retelling of a medical text, and the encyclopedia's salt entry does not mention tooth care, so treat the tradition as plausible but only thinly documented.

What does research say? A 2026 scoping review in Dentistry Journal mapped 17 studies of salt-based oral care, with a median of 41 participants. Plain salt-water rinses did about as well as chlorhexidine on periodontal and antimicrobial measures in three studies, but the authors call the evidence limited and not ready for clinical recommendations, note that most studies were small and short, and say swallowed sodium was not assessed. A 23 percent saline was poorly tolerated in one study. A separate 2025 trial of 40 people with minor mouth ulcers compared a 10 percent bamboo-salt rinse with a benzydamine rinse over five days: ulcers shrank faster with bamboo salt on day 3 and healing took 5.25 days against 6.85, but several results were only marginal and the trial was small. Neither study supports scrubbing teeth with coarse salt.

Skin: scrubs and salt rooms

I found no Korean reference source or trial on salt scrubs for the face. The American Academy of Dermatology cautions that physical scrubs may be too irritating for dry, sensitive or acne-prone skin and should never be used on cuts or sunburned skin. Salt crystals are sharp and sting broken skin, so a salt scrub is at most for tougher areas, followed by moisturizer. In bathhouses salt appears as a heated room, described in jjimjilbang. For atopic dermatitis, a 2025 systematic review in Cureus of 10 studies of seawater-based therapies, mostly baths and Dead Sea climatotherapy, reported moderate benefit but too few, too varied studies to pool, with mostly mild stinging or redness. That speaks to supervised seawater treatment, not to a kitchen scrub.

The sodium caution

Salt that is swallowed counts as sodium. The World Health Organization recommends adults take in under 5 g of salt (2,000 mg of sodium) a day. The encyclopedia puts Korean intake at about 15 g a day, mostly from processed foods. A 2023 Heliyon paper on bamboo salt notes in its introduction a case of severe hypernatremia from eating too much bamboo salt, and the paper itself tests no health claims. See sodium in Korean food.

Evidence status

• Salt in food: deeply documented.
• Bamboo salt origin: disputed in the encyclopedia itself; the modern product dates from the 1980s.
• Oral care: small, short studies; no recommendation yet.
• Skin: no trial of salt scrubs found; irritation is the main risk.
• Practical note: do not swallow rinses, keep salt off broken skin, and anyone on a sodium-restricted diet should check with a clinician.