Question: Is it permissible for a fasting person to wear perfume or use Siwaak (tooth-cleansing stick) during the daytime? Likewise, is it permissible for women to henna their hair or apply oil?
Answer: It is permissible for a fasting person to apply perfume to the body, head cover, or clothes. However, one should not sniff it through the nose. Siwaak may also be used during the daytime in Ramadaan. In this regard, the Prophet (peace be upon him) said: Had it not been for fear of overburdening my Ummah, I would have ordered them to use Siwaak at every Salaah. (Agreed upon by Al-Bukhaaree and Muslim). The Hadeeth broadly applies to Duhr (Noon) and `Asr (Afternoon) Prayers whether one is fasting or otherwise… read more here.