3 severe mouth ulcers in last 3 months?

My dad has had 3 severe mouth ulcers in the last 3 months, he has a good diet and does not eat much sugary foods.

They take about 1-2wks to go away fully.

Could this be something serious like mouth cancer?

I'm getting really worried as my mum died of cancer when I was younger. Please help.

What do you mean by good diet? Is it balanced diet with fruits and also veggies? How bout his oral hygiene? Did he eat something that could injured his oral mucosa? Did he drink enough water?
But to make sure better check to your doctor.

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