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Mouth Ulcers

Mouth Ulcers: Causes, Symptoms, Types, Treatments and Prevention.

Mouth ulcers are sores that appear within the mouth, often on the inside of the lips or cheeks.
The person suffering from a mouth ulcer can find it difficult to eat, drink or even brush their teeth.

Most mouth ulcers are usually harmless and will clear up on their own within a week.
However, if the mouth ulcer is still around after three weeks please sought medical advice by visiting your local doctor or dentist.

What causes Mouth Ulcers?

  • Acidic foods can trigger mouth ulcers
  • Accidentally biting the cheek
  • Constant rubbing from misaligned or sharp teeth, braces, dentures, etc.
  • Cold sores (Herpes Simplex)
  • Certain diseases – Tuberculosis, Diabetes, etc.
  • Oral thrush infection
  • Poor oral habits
  • Impaired immune system


  • Sores within the mouth that are round and are of a white or grey colour with a red border
  • Problems with chewing and brushing teeth
  • Swollen skin surrounding the sore
  • In extreme cases – Fever, swollen lymph nodes or feeling physically sluggish
Mouth Ulcers
Mouth Ulcers - Herpetiform

Main Types of Mouth Ulcers:


Minor: Usually these are around 2-8mm in diameter and clear up within 2 weeks


Major: These tend to be deeper and bigger and can take several weeks to heal and may leave A scar within the mouth.


Herpetiform: This is a cluster of numerous smaller sores around the size of a pinhead. This type of ulcer can recur often over a long period of time.


  • In most cases the pain from a mouth ulcer will lessen within a couple of days and will heal without treatment in one to two weeks.
  • In a more severe case your dentist or doctor may recommend an antimicrobial mouth rinse
  • Antiseptic gel can also be placed on the ulcers
  • In extreme cases you may be prescribed a topical medication for the inflammation
  • Try to avoid spicy / sour foods
  • Regularly rinse your mouth with warm salty water
  • Maintain good oral hygiene




  • Avoid certain foods (acidic/spicy) that trigger or worsen the symptoms
  • Good oral hygiene
  • Managing diseases such as Diabetes appropriately
  • Visiting your dentist regularly
Mouth Ulcers - Remedy


In most cases mouth ulcers are harmless, however if they persist after a couple of weeks please seek medical advice.

If you live on the Sunshine Coast (Noosa) and would like to find out more information regarding mouth ulcers, or any other oral health questions feel free to give our team at “The Dental Junction” a call on 07 5473 5117 or contact us via the Website.

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