There's really no cure for bad breath so you cannot cure bad breath permanently.
However you can help keep your bad breath at bay by using mouthwash, brushing your teeth, gargling with apple cider vinegar and going to the dentist often to have a dental checkup and cleaning of the teeth.
You can also use breath spray to help kill bad breath in your mouth.
Also make sure to stay hydrated by drinking plenty of water and floss your teeth often and brush your teeth often to avoid bacteria in your mouth.
You can also clean your teeth of bacteria by doing oil pulling which helps draw out the bad bacteria in your mouth.
Using breath mints can also help keep the bad breath at bay but there's really no cure for bad breath.