These factors are:
- Poor oral hygiene caused by not brushing or improper tooth brushing technique.
- A dirty tongue.
- Cavities in the teeth.
- Gum disease caused by plaque and tartar.
- Dirty dentures, false teeth and other fixed appliances in the mouth.
After having identified the causes, we can now deal with how to prevent bad breath, especially while fasting:
- Brushing one's teeth after every meal, preferably early morning (at Sehri time).
- Flossing one's teeth which mean cleaning between the teeth using special thread called dental floss. Use of toothpicks is not advisable for this purpose.
- Use of a tongue or using a toothbrush to clean the tongue.
- Use of an anti-bacterial mouthwash. A non-alcoholic mouthwash should be used as alcohol causes a dry mouth which can aggravate the problem.
- Cavities in the teeth should be filled promptly to prevent food accumulation within them.
- Removal of tartar on teeth by a dentist at least once every six months.
- Drink at least 2-3 glasses of water at Sehri time.
A bad stomach can also cause bad breath so one would have to check on his diet during the holy month of Ramadhan to prevent a stomach upset and halitosis.
Foul-smelling mouths are offensive to other people therefore it is important to spend some time and follow the simple precautions and methods mentioned to prevent this problem.
Islam urges its followers to be clean, decent, and pleasant in their appearance and smell. In this respect, you can have a mouth wash and gargle it but be careful not to allow the water goes into your stomach as best as you can. During the Holy Prophet's lifetime, he (pbuh) and his Companions used to have Siwak (Miswak or Tooth stick) to keep their mouth fresh and clean.
Many people avoid brushing their teeth during the day in Ramadhan. This is a mistake, since there is no contradiction between observing the fast during Ramadhan and brushing one's teeth. Moreover, Holy Prophet (pbuh) said: "Were it not for the hardship that I would be placing upon my people, I would have ordered them to engage in Siwak (wooden toothbrush) for every prayer." [Sahih al-Bukhari (887) and Sahih Muslim (252)]
We must understand that the word "Siwak" does not just refer to the tree branches that are used as tooth sticks, but to the act of brushing the teeth itself. It is derived from the verb sak, meaning to rub, clean, buff, or polish.
So, we should keep our mouth and body clean and free of any bad or horrible smell, especially when you are working with a non-Muslim who may accuse Islam or insult Muslims because of Ramadhan fasting. Allah says: "Keep you duty to Allah as far as you can." (Holy Quran 64:16)