Prior trial in Korea / repurchase
Many reviewers first tried the toothpaste while traveling in Korea or purchased a single tube, liked it, and later repurchased online, indicating strong repeat-buy behavior.
Social media / word-of-mouth buzz
Several buyers mention purchasing because the product was 'trending' or recommended on SNS, Instagram, or by friends, suggesting influencer/viral discovery drives new trial.
Coffee, tea, and smoking stain concerns
A large share of heavy coffee/tea drinkers and occasional smokers bought it specifically to counter discoloration from these habits.
Sales, bundle pricing, and travel-size inclusion
Reviewers frequently cite discounted bundle prices and the included mini travel-size tube as reasons for purchasing, especially for stocking up or gifting.
Professional or dental recommendation
A few reviewers, including a self-identified dental hygienist and one recommended by a dentist, purchased it for maintenance whitening between professional treatments.