Costus indian mouth rinses are very effective against canker sores, if the problem is not related to the colon or if canker sores are rare during the year. As for people who have immune problems, and have been prone to canker sores since childhood, medicinal mushrooms will be used, as they are very effective.
What the science says: costus (qust al-hindi), mouth and teeth
What the published research says about the remedies mentioned above, for context — the studies address material causes; healing belongs to Allah.
Costus (qust al-hindi)
Recommended in the hadith for sore throats and pleurisy, costus (Saussurea costus) is the subject of pharmacological reviews detailing its anti-inflammatory, antimicrobial, and hepatoprotective compounds (Naunyn Schmiedebergs Arch Pharmacol, 2024) (Heliyon, 2024) (J Ethnopharmacol, 2007). Precaution: do not confuse it with related toxic species; use a powder from a trusted source, in small doses, and exercise caution during pregnancy.
Mouth and teeth
Siwak reduces plaque and gum inflammation (Saudi Med J, 2015) (J Ethnopharmacol, 2022); propolis is studied for oral health (J Funct Biomater, 2024), and honey for mouth sores. Salt water rinses, clove for tooth pain, less sugar: the basics. Precaution: a cavity, an abscess, or gums that bleed persistently need to be treated by a dentist — natural remedies can provide relief in the meantime, but they do not fix the underlying problem.
