As I say mint has been used for centuries as a remedy for many things and without knowing we still use it for lots of the same things today.
Freshening breath, has been one of its uses over the years, and now it is the base flavour for many things breath related including toothpaste, chewing gum and mouth wash. By chewing fresh mint you would get the benefits too, and also help the digestion while you are at it. Mint stimulates the salivary glands and helps the digestive process which leads us into the part mint can play when you are feeling queazy.
It is great for nausea, and again has been used for years to help settle upset stomachs, we use mint in oil capsules now to get a more concentrated dose of the menthol oils.
Mint is also great for headaches, you can wet some mint and massage into your temples, it has a good anti inflammatory action which will help and is cooling if you have a temperature.
A lot of its healing power comes from something called rosmarinic acid, which is a polyphenol that is also found in rosemary. It also contains a lot of iron, manganese, and vits A,C and a few Bs.
Try it in salads, tea, juices and soups, it is super easy to grow, and it is super hardy, be warned it can take over!