Sahih Bukhari Volume 7, Book 72, Hadith Number 826.

Narrated By Ibn Mas’ud : Allah has cursed those women who practise tattooing or get it done for themselves, and those who remove hair from their faces, and those who create spaces between their teeth artificially to look beautiful, such ladies as change the features created by Allah. Why then shall I not curse those whom Allah’s Apostle has cursed and who are cursed in Allah’s Book too?