Permissible Acts during Fasting
1- Bathing and sitting in a pool of water to cool oneself off.2- Swallowing one’s spit and mucus.3- To taste food on the condition that none of it slips into the throat.4- To smell the odor of any substance or fragrance of air fresheners.
- The use of a chewing stick :It is permissible for someone who is fasting to use a chewing stick before and afternoon, regardless of whether the chewing stick is wet or dry. However, he should be careful when using a wet chewing stick not to allow pieces of it to slip into his throat, because by that his fast would become invalidated.
source: islamkingdom