A mouth ulcer is the
loss or erosion of part of the delicate tissue that lines the inside of the
mouth (mucous membrane).
There are many things
that cause mouth ulcers. The most common cause is injury (such as accidentally
biting the inside of your cheek). Other causes include aphthous ulceration,
certain medications, skin rashes in the mouth, viral, bacterial and fungal
infections, chemicals and some medical conditions.
An ulcer that won’t
heal may be a sign of mouth cancer.
In most cases, mouth
ulcers are harmless and resolve by themselves within 10 to 14 days without the
need for treatment.
Aphthous ulcers
Aphthous ulcers are
recurring ulcers which affect around 20 per cent of the population. Although in
most people there is no known cause for aphthous ulcers, in a small number of
people these ulcers may be due to an underlying Vitamin B, folate or iron deficiency.
Mouth ulcers that won't heal
See your dentist or
doctor if your mouth ulcers don’t clear up within 2 weeks, or if you get
them frequently.
It’s important not to
ignore an ulcer that you have had for more than 2 weeks, especially if you use
tobacco products and drink alcohol regularly. This is because tobacco use and
drinking alcohol increase your risk of mouth cancer.
Symptoms of mouth ulcers
The symptoms of a
mouth ulcer depend on the cause, but may include:
- One or more painful sores on part of the skin lining
the mouth.
- Swollen skin around the sores.
- Problems with chewing or tooth brushing because of the
tenderness.
- Irritation of the sores by salty, spicy or sour foods.
- Loss of appetite.
Aphthous ulcers
generally occur on the softer mouth lining of the lips, cheeks, sides of the
tongue, floor of the mouth, back of the roof of the mouth and around the tonsil
area. These ulcers are usually no larger than 5mm. You may develop more than
one aphthous ulcer at a time, and sometimes these ulcers are joined together.
Causes of mouth ulcers
Mouth ulcers can be
caused by a wide range of factors including:
- Accidentally biting the inside of your cheek.
- Injury from a toothbrush (such as slipping while
brushing).
- Constant rubbing against misaligned or sharp/broken teeth.
- Constant rubbing against dentures or braces.
- Burns from eating hot food.
- Irritation from strong antiseptics, such as a
mouthwash.
- Viral infections such as the herpes simplex viral infection (cold
sore).
- Reaction to certain medications.
- Skin rashes in the mouth (for example, lichen planus).
- Autoimmune diseases.
- Underlying vitamin or iron deficiency.
- Underlying gastrointestinal disease such as Crohn’s disease or coeliac disease.
- Mouth cancer.
- Ulcers may become worse during periods of stress, illness or extreme fatigue.
When to seek treatment for mouth ulcers
If ulcers are
interfering with your normal daily activities, or have persisted for 2 weeks,
see your dentist or an oral medicine specialist.
In some cases, you may
need blood tests if it’s suspected that you have an underlying deficiency
(such as an iron, folate or vitamin B deficiency) or an inflammatory condition.
If your oral health
professional can’t determine the cause of your mouth ulcers, or if the ulcers
don’t respond to the normal treatments, you may need to have a biopsy of part of the ulcer and some of the surrounding tissue. A
biopsy is a procedure where a tissue sample is taken for examination and
diagnosis.
Treatment for mouth ulcers
Most mouth ulcers are
usually harmless and resolve by themselves within 10 to 14 days. Other types of
mouth ulcers, such as the aphthous variety or those caused by herpes simplex
infection, need topical treatment (such as a mouthwash, ointment or gel).
It’s not possible to
speed up the recovery of ulcers, but the symptoms can be managed and the risk
of complications reduced.
Treatment options for
mouth ulcers include:
- Avoid spicy and sour foods until the ulcers heal.
- Drink plenty of fluids.
- Keep your mouth clean.
- Apply antiseptic gel to the ulcers.
- Regularly rinse your mouth out with warm, slightly
salted water, keeping the rinse in your mouth for up to 4 minutes at a
time.
- Use an alcohol-free medicated (preferably containing
chlorhexidine gluconate) mouthwash twice daily.
- Use a topical alcohol-free steroid mouthwash or
ointment – this is generally prescribed by your dentist or oral medicine
specialist.
- If required in severe cases, immunosuppressant
medication may be prescribed by your oral health professional.
Prevention of mouth ulcers
Mouth ulcers can be
avoided in some cases by:
- Brushing your teeth gently with a soft toothbrush,
taking care not to slip with the brush.
- Eating a well-balanced and nutritious diet.
- Making sure that underlying medical conditions are
well-controlled.