The “faces of methamphetamines” refers to the physical and psychological effects that can occur with the use of methamphetamine. Long-term psychological consequences include anxiety, paranoia, and even psychosis, while short-term physical symptoms include elevated heart rate, rising body temperature, and reduced appetite. Acne, weight loss, and “meth mouth” are just some of the external changes that may occur due to chronic methamphetamine consumption (tooth decay and loss).