[3][5][6] "The Power of Smile/Remember the Kiss" was Kokia's first single released after her long-charting hit "Kawaranai Koto (Since 1976)," which had been used as the daytime TV drama Itoshiki Mono e's theme song.

And is listed as gold on the RIAJ Japanese chart database[8][4] Other than through Kao commercials featuring "The Power of Smile," the single was promoted in a variety of ways.

Kokia was featured in September issues of magazines CD Data, CD-Hits, Weekly Oricon and What's In?, and appeared on a multitude of radio shows at the time.

[2] Kokia appeared on popular TV show Music Station to perform the song on October 17, more than three weeks after the single's release.

"[10] The song was inspired by the events of the September 11 attacks, and is a prayer for love and peace written by Kokia.

While the original Taisuke Sawachika arranged version appears on the single, an acoustic version called "Remember the Kiss (Duet "Kokia & Piano")" appears on the album Remember Me, released several months after the single.

[16][17][18][19] This version features as a bonus track on the Japanese version of Kokia's Christmas album Christmas Gift, released in November 2008 and also on Kokia's free release EP Music Gift that was handed out in New York in December 2008.

[21][22] The video for "The Power of Smile" begins by featuring Kokia against a white background, where flowers start to be drawn behind her.

The drawn flowers are replaced with real grass, and the next scene shows Kokia singing in a field at twilight.

[24] Music critic Takeshi Ōsuka called the song "high quality" and likened her falsetto voice to Kate Bush, however found her Japanese lyrics mediocre.

[25] CDJournal called "Remember the Kiss" a "magnificent ballad, reminiscent of journey of love and youthfulness.