A patient with a history of methamphetamine addiction presents with severe xerostomia, rampant caries affecting multiple teeth, and poor oral hygiene ('meth mouth'). What is the most appropriate restorative material for a single carious lesion?

In a patient with active methamphetamine use, multiple carious lesions, and poor oral hygiene, the immediate priority is caries control and stabilization of individual teeth using composite resin restorations. These are cost-effective, quick to place, and preserve tooth structure. More extensive restorations such as crowns, veneers, or PFMs are deferred until behavior modification, improved hygiene, and salivary management (e.g., saliva substitutes, fluoride) are established. Placing expensive restorations prematurely in an uncontrolled cariogenic environment risks rapid failure.