Most toothpastes have peppermint in them, so most people already use this pure essential oil on a daily basis...it's even in chewing gum and shampoo!  Refreshing and invigorating, it stimulates and antioxidizes...is a great treatment for headaches, can soothe a nauseous tummy and improves memory and concentration...and who doesn't need memory improvement?!? 
 
Botanical Name:  Mentha Piperita