i agree with baldrick while i am fasting myself... i have noticed a few co-fasters :D do not brush their teeth during ramadan...causing discomfort for fellow workers.

this is not proper etiquette of ramadan... best would be to brush the teeth after suhoor before the fajr prayer.

moreover using the miswak is anyways allowed so we must make use of this 'sunnah' and avoid smelly breath.

at the same time avoid dry mouths by timely frequent supplications like reciting 'SubhanAllah Wabihamdihi SubhanAllah AlAdheem' 100 times daily would have your sins forgiven if they are as many as the foams in an ocean. so try breaking it into 20 periodically.

you could simply recite subhanAllah, Alhamdulillah Allahuakbar too...