What is the causes to have mouth sores every month

Dear Customer
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How to deal with mouth sores ?
1. have plenty of warm fluids 
2. drink containing vitamin C drinks or food 
3. sesame oil and sesame syrup
4. use mouth washs that contain chlorhexidine 
5. gels or designs medications for mouth ulcer that contain special herb or vitamin for your case such as vitamin B2 
6. if you condition persisit , consult an dental doctor to do the needed medical examination and determine the treatment pathway
What are the causes of mouth sores ?
the cause is still unclear , but its most likely to have mouth ulcer in those condition :
1. if you have history of mouth ulcers or family history 
2. got cold , or wearing less needed cloths according to weather temprature 
3. in persisitant cases or severe symptoms , viral infection may be the cause 
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Kind Regards