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Dear Customer
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Regarding your question

causes of white gum :

• there are many causes of white gum 
• smoking is the most common cause 
• broken teeth ,or plaques 
• gingivitis is also cause of white gum 
• anemia 
• fungal infection 
• oral cancer .

what should you do 

• you should visit a doctot for physical examination and to rule out precancerour or even cancerous lesions 
• this is done by physical examination 
• if there is broken toothpr plaque ,it should be fixed .
• if there is suspicious for precancerous lesion ,biopsy may be recommended .

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