Older men in rural areas are the focus of this year's Mouth Cancer Awareness Day.
The organisers have said isolated older men are vulnerable because a greater percentage smoke and drink, and they are reluctant to seek medical help.
More than 100 people die every year from mouth cancer - that is greater than the number who die from skin cancer.
Dentist Dr Gillian Smith has said people should be aware of the symptoms.
Symptoms include: ulcers that do not heal within three weeks, red or white patches in the mouth, or other unusual changes in the mouth or neck.