White patches could potentially mean HIV or cancer, Dr Kinsella told MailOnline.
Although they are usually harmless, Leukoplakia as the patches are known, can be caused from smoking.
She said: “On very rare occasions white patches in the mouth can be a sign of HIV or cancer – your dentist will examine the patch to rule out fungal infections and check it hasn’t been caused by biting.”
Persistent ulcers, the experts say, oral cancer.
It can occur when a tumour develops in the mouth, including the ‘lips, tongue, gums and tonsils’.
Lumps in your mouth that don’t go away, tooth looseness or numbness are also worth checking out.
If caught early it’s often treatable – so make sure you speak to your dentist.
Women who discover a red growth that appears on the gum that can bleed easily have been told that it could even be a sign of pregnancy.
However, it should be checked out to ensure it doesn’t develop into more severe gum disease.
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