No Confidence in their Smile?
The Japanese are about one third as likely to say that they are confident in their smile (Funaki, 2006, p.29), because I believe and as Hamaguchi, Takemoto and Tobimatsu (in preparation) demonstrates, the Japanese express their confidence with their smile not about it.
Takemoto, Hamaguchi, & Tobimatsu .(in preparation). The Japanese smile as a symbol of positive self-regard.
舩木純三. (2006). クリニカル 笑顔の効用とスマイルトレーニングの必要性. 日本歯科医師会雑誌, 59(7), 631-639.