Journals
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Does Tea Stain Teeth? Per-Tea Risk + 6 Ways to Prevent (Dentist-Cited)
Quick answer: Yes — tea can stain teeth. The cause is tannins, plant polyphenols that contain colour-producing chromogens which bind...
Tangerine Pu-erh vs Oolong vs White vs Black: Xiao Qing Gan 4-Way (2026)
Quick answer: The classical xiao qing gan (小青柑) tradition pairs young green tangerines with aged shou pu-erh. O2H TEA is...
