To smell or taste mint in you dream suggests that there is a calming influence in your life. You may be too overexcited or hyperactive and need to relax. Alternatively, the dream refers to a situation or relationship that you need to soothe over. Perhaps it is time to make amends.
To eat a breath mint in your dream indicates that you are trying to phrase your thoughts in a way that is going to be presentable or more palatable. Alternatively, a breath mint may mean that you have said something that has offended someone.