PowerPoint Presentation Muscular System Whatâs this? Whatâs this? Canker sore! Shallow ulcers in the mouth What causes them? Stress or tissue trauma Citrus can trigger…
PowerPoint Presentation Muscular System Whatâs this? Whatâs this? Canker sore! Shallow ulcers in the mouth What causes them? Stress or tissue trauma Citrus can trigger…