Final answer:
For a Parkinson's disease client taking benztropine and experiencing dry mouth, chewing sugarless gum is recommended, as it helps stimulate saliva production safely.
Step-by-step explanation:
When a client who has Parkinson's disease and is taking benztropine reports a dry mouth, the nurse should recommend that the client chew sugarless gum. This is because sugarless gum can stimulate saliva production without contributing to tooth decay, offering relief from dry mouth without unwanted side effects. Other options like lemon-glycerin swabs can be too harsh and drying, increasing discomfort, and rinsing with nystatin is used to treat fungal infections, not as a solution for drug-induced dry mouth.