October 1, 2015 My significant other’s bad breath means he/she is not using proper oral hygiene. TRICK. While morning breath may make you shudder, improper oral hygiene is only one potential cause of bad breath. Plaque build-up can cause halitosis, but so can illnesses, mouth breathing and certain medications. Drinking more water throughout the day increases saliva production and can protect against bad breath. For those who have tried increased oral care to no avail, schedule an appointment with us so we can check for other issues. For those whose halitosis is caused by the condition dry mouth, we can prescribe a mouth rinse or medication to boost saliva flow.