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Studies suggest that several combined factors cause mouth sores, according to Mayo Clinic. Injuries to the mouth, stress, not getting enough nutrients and food sensitivities are all common causes.


A sore mouth can be caused by a systemic illness, a local infection, an allergic reaction, an irritant or improperly fitted dentures, according to Merck Manuals. It can also result from chewing tobacco, wearing braces and trauma to the mouth, such as accidental bites an...


Some treatments for mouth sores include avoiding hot, spicy, salty and sugary foods, alcohol and tobacco, gargling with salt water, eating ice cubes and taking pain medicine, such as acetaminophen, according to Healthline. Usually mouth sores disappear between 10 and 14...


Depending on the type of mouth sore, treatment usually involves over-the-counter topical ointments and creams. The National Health Service explains that cold sores may require antiviral medication because they are usually caused by the herpes simplex virus type 1. Canke...


Abreva is a commonly used topical treatment to reduce outbreak length and is available over the counter, according to WebMD. Other treatments include Zovirax, Famvir and Valtrex, which are available by prescription.


Common types of mouth sores include cold sores and canker sores. In addition, mouth sores may be the result of injury, or they may be a symptom of a more serious disease such as lupus, cancer or hand-foot-mouth disease, MedlinePlus explains.


Sores inside the mouth, specifically canker sores, can be caused by injury or stress, according to WebMD. Some people are susceptible to sores from eating foods that irritate the tissue of the mouth. These foods can be high in acids and include tomatoes, strawberries, p...