On the authority of Abu Harayrah (may Allah be pleased with him) from the Prophet (peace be upon him), who said: Allah (mighty and sublime be He) says:
“ Fasting is Mine and it I who give reward for it. [A man] gives up his sexual passion, his food and his drink for my sake. Fasting is like a shield, and he who fasts has two joys: a joy whin he breaks his fast and a joy when he meets his Lord. The change in the breath of the mouth of him who fasts is better in Allah’s estimation than the smell of musk.“ It was related by al-Bukhari (also by Muslim, Malik, at-Tirmidhi, an-Nasa’i and Ibn Majah).
So personally I care about what ALLAH(SWT) likes! Obviously bad breath is common so I use Miswaak throughout the day especially before salaat and after Suhoor so Alhumdulillah my breath doesn't smell as other people's. Also as the sister mentioned don't breath into people's faces if you feel your breath is bad. Like don't stand sooooo close if you want to talk to someone, or cut down on the talking. InshaALLAH it doesn't have to be such a big issue.
This might be useful:
Causes of bad breath can be broadly classified into local causes and systemic causes. Causative factors within the mouth are termed local causes. Causes due to factors or diseases of the body, such as diabetes, smoking, kidney disease and stomach upset are known as systemic causes. We will be limiting our discussion to local causes only
Local Causes: Within the human mouth there are numerous kinds of bacteria, which, as by-products, give out sulphides and ammonia which are the main causes of bad breath. Hence the amount of bacteria has to be controlled, and conditions that cause them to thrive have to be eliminated
These factors are:
1. Poor oral hygiene caused by not brushing or improper tooth brushing technique
2. A dirty tongue
3. Cavities in the teeth
4. Gum disease caused by plaque and tartar
5. 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.
1. Brushing one’s teeth after every meal, preferably early morning (at Sehri time)
2. Flossing one’s teeth which means cleaning between the teeth using special thread called dental floss. Use of toothpicks is not advisable for this purpose.
3. Use of a tongue or using a toothbrush to clean the tongue.
4. Use of an anti-bacterial mouthwash. A non-alcoholic mouthwash should be used as alcohol causes a dry mouth which can aggravate the problem.
5. Cavities in the teeth should be filled promptly to prevent food accumulation within them.
6. Removal of tartar on teeth by a dentist at least once every six months.
7. 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 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.