Pansit-pansitan (Peperomia pellucida) is a medicinal herb widely used in traditional Filipino medicine for a variety of ailments, including inflammatory conditions and skin problems. Its use for canker sores (aphthous ulcers) is primarily based on anecdotal reports and folk traditions rather than rigorous scientific validation. In Philippine traditional medicine, crushed leaves are sometimes applied topically or used as a mouth rinse to help soothe oral sores, including canker sores, due to their perceived anti-inflammatory and cooling effects.

Scientific studies on Peperomia pellucida have identified some anti-inflammatory and antimicrobial properties, which could theoretically benefit oral ulcers. However, there are no well-controlled clinical trials or specific studies directly evaluating the effectiveness of pansit-pansitan for canker sores in humans. The few available studies focus on its general anti-inflammatory and wound healing properties in animal models or cell cultures.

In summary, while pansit-pansitan is traditionally used for canker sores in some cultures and has demonstrated relevant biological activities in laboratory settings, scientific evidence supporting its use for this specific condition in humans is lacking. The rating reflects a reliance on tradition with only minimal indirect scientific support.