Conclusion
Most ulcers appear for no apparent reason, and although they are obnoxious, they usually heal on their own after a week or two. However, it is advisable to visit your dentist if you have a canker sores that has not disappeared after 3 weeks, as it could be a sign of mouth cancer. To increase immunity, however, a healthier lifestyle is needed, drinking more water daily and eating healthy foods like carrots and broccoli, which are rich in vitamin A, and fish, milk, meat and whole grains that contain zinc and selenium are advisable.
References:
[1] https://greatist.com/health/how-to-get-rid-of-canker-sores
[2] https://www.californiateahouse.com/tea-blog/remedy-for-canker-sore-black-and-green-tea
[3] https://greatist.com/health/how-to-get-rid-of-canker-sores#canker-sore-remedies
[4] https://myhealth.alberta.ca/health/Pages/conditions.aspx?hwid=zd1065#:~:text=Avoid%20coffee%2C%20chocolate%2C%20spicy%20or,can%20cause%20a%20stinging%20pain.
[5] https://greatist.com/health/how-to-get-rid-of-canker-sores#canker-sore-remedies
[6] https://www.mayoclinic.org/diseases-conditions/canker-sore/diagnosis-treatment/drc-20370620
[7] https://greatist.com/health/how-to-get-rid-of-canker-sores#canker-sore-remedies
[8] https://www.healthline.com/health/canker-sores#home-relief
[9] https://health.ucsd.edu/news/features/Pages/2019-07-08-otc-oral-health.aspx#:~:text=Foaming%20agents%20in%20toothpaste%20such,available%20without%20sodium%20lauryl%20sulfate.
[10] file://C:\Users\gyw\Desktop\Entirely Health\1.20\How to Get Rid of Canker Sores\You have to quit smoking: You have stopped smoking and have found that you are developing more ulcers than normal. It is a totally normal symptom that affects 2 out of 5 people who quit smoking in the first few months, along with frequent coughs, sneezes and sore throats.
[11] https://myhealth.alberta.ca/health/Pages/conditions.aspx?hwid=zd1065#:~:text=Avoid%20coffee%2C%20chocolate%2C%20spicy%20or,can%20cause%20a%20stinging%20pain.