For the most part, teeth whitening does not cause canker sores. There has been a linked discovered between canker sores and the whitening agent Sodium Lauryl Sulfate, which is often used in whitening toothpaste. If you continually get canker sores and use whitening toothpaste, check the ingredients list for this chemical. If not, your sores are likely caused by other things. There is a lot of question as to what actually causes canker cores but some causes include viral causes, certain foods such as citrus items, and mouth irritation. These are just some of the potential causes of canker sores
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