What is a common symptom of methamphetamine use?

Severe dental problems, often referred to as "meth mouth," are a well-documented and common symptom associated with methamphetamine use. This issue arises from a combination of factors that include dry mouth, poor oral hygiene, and the acidic nature of the drug itself. Methamphetamine can cause a significant decrease in saliva production, which is crucial for maintaining oral health. When saliva levels drop, the mouth becomes more susceptible to bacteria and decay, leading to severe dental issues such as cavities, gum disease, and tooth loss.

In contrast, the other options reflect benefits or outcomes that are generally not associated with methamphetamine use. Increased concentration and enhanced memory may seem positive but are misleading, as methamphetamine typically leads to a range of cognitive impairments over time. Lastly, methamphetamine use is often linked to weight loss rather than weight gain, as it is a powerful stimulant that decreases appetite. Therefore, the association between methamphetamine and severe dental problems is not only common but also a significant health concern for users.