Peppermint essence (or peppermint oil) has a long history of traditional use for oral health, including soothing oral discomfort and freshening breath. In the context of canker sores (aphthous ulcers), its application is generally based on anecdotal or folk remedies rather than robust scientific evidence. Traditional use is likely grounded in peppermint’s well-known cooling and numbing properties, which may provide temporary relief from the pain or irritation associated with canker sores. The active compound, menthol, creates a cooling sensation and can act as a mild local anesthetic.

However, there is very limited scientific research specifically evaluating peppermint essence for the treatment or healing of canker sores. Most clinical studies on peppermint focus on digestive health, such as irritable bowel syndrome, rather than oral lesions. While peppermint oil has demonstrated mild antimicrobial activity in some laboratory settings, there is insufficient evidence to confirm its efficacy or safety in treating canker sores. In some cases, strong essential oils can even cause irritation or allergic reactions in sensitive oral mucosa.

In summary, the use of peppermint essence for canker sores is rooted in traditional practice, with theoretical benefits for symptom relief, but lacks direct scientific validation. Evidence supporting its use is weak, and caution is advised due to the potential for irritation.