Foul smelling breaths, commonly known as bad breath, can cause discomfort and embarrassment for many people. However, there are several synonyms that can be used instead of the phrase "foul smelling breaths". One option is halitosis, which is a medical term for bad breath caused by bacteria in the mouth. Another synonym is oral malodor, which refers to a strong and unpleasant odor that originates from the mouth. Additionally, phrases such as unpleasant breath, offensive breath, or simply bad breath can also be used. It is important to address bad breath with proper dental hygiene and medical attention if necessary.