Can mouth ulcers be transmitted through kissing?

Most young people tend to stay up late, leading many—especially those in passionate romantic relationships—to develop recurrent aphthous ulcers (canker sores). So, can canker sores be transmitted through kissing?

Can canker sores be transmitted through kissing?

No, canker sores are not contagious through kissing. They are commonly caused by genetic predisposition, decreased immunity, high psychological stress, vitamin deficiencies, or oral trauma. Treatment options include applying lidocaine gel or benzocaine gel to the affected area for pain relief; using chlorhexidine mouthwash to reduce inflammation; and applying Bingpeng San (a traditional Chinese herbal powder) or watermelon frost preparations to promote wound healing. If the ulcers result from vitamin deficiency, supplementation with vitamin C or B-complex vitamins—as prescribed by a physician—is recommended.

After developing canker sores, patients should avoid spicy or irritating foods. Additionally, they should refrain from consuming foods that may cause further oral injury and maintain good oral hygiene. It is advisable to adopt proper brushing techniques and brush teeth regularly each day. Furthermore, attention should be paid to food hygiene to prevent infection and related complications. A regular daily routine—including avoiding excessive late-night activity—is also essential.

If symptoms are severe, prompt medical consultation is advised, and medications should be used strictly as directed by a healthcare professional. We hope this information has been helpful!