Dear Lybrate user,
mouth ulcer can be occur due to any reasons like junk food/ body dehydration and depression, anxiety also
so you should take some precautions
using a soft toothbrush to brush your teeth
avoiding hard, spicy, salty, acidic or hot food and drink until the ulcer heals
using a straw to drink cool drinks
avoiding things that may be triggering your mouth ulcers like smoking, drinking etc. And for permanent treatment you can contact us for homeopathic treatment.