There are some actions that are permissible to do while fasting, which will not nullify the fast.
* Taking a shower
It is permissible to shower, for any reason, even if you are showering due to thirst or being overheated.
* Rinsing the mouth and nose It is permissible to rinse the mouth and nose without exaggeration; using too much water may cause you to swallow water, which may invalidate your fast.
* Applying eyeliner or eye drops It is permissible to apply kohl (eyeliner) or eye drops or anything else to the eyes, even if some taste from it finds its way to the throat.
* Taking injections It is also permissible to take injections for nutritional or medical purposes; there is no text that proves this invalidates the fast.
* Taking suppositories Similarly, it is permissible to have an enema or douche. The injection of liquid into the rectum through the anus for cleansing, as a laxative, or for other therapeutic purposes, or the use of a suppository (a solid medication designed to melt within a body cavity) or any other medicine that can be used in the private parts, whether in the front or back is permissible. There is no text that considers these acts to nullify the fast.
* Accidental consumption Your fast will not become invalid if you consume something that you could not protect yourself from. For example, swallowing your saliva or accidentally swallowing dust or sifted flour that has accidentally entered your mouth.
* Tasting food with the tongue Your fast will be valid even if you taste food with your tongue or use toothpaste or mouthwash as long as nothing is swallowed.
* Breathing in different scents
* Kissing and embracing one's spouse It is permissible to kiss and embrace your spouse as long as one is able to control oneself.
* Drawing blood It is also permissible to draw blood in any amount for any reason. If drawing blood weakens the person, it will be considered a disliked action.
* Being in a state of janaabah Your fast will still be valid even if you find yourself in a state of janaabah (a major ritual impurity) after fajr (dawn) has arrived. Ghusl (a full bath) can still be performed once the time of fajr has begun.