食後は口の中をきれいにしましょう。うがいをしましょうか？ — Let's keep your mouth clean after the meal. Shall we do some rinsing? (Care · Daily · Support, Formal to Senior, JLPT N4)

Gesture & etiquette

After the meal, gently hand them a cup of water; stand or sit at their eye level; use a calm, unhurried pace; smile reassuringly.

Frame oral care as something natural and refreshing rather than a medical procedure — the phrasing 'きれいにしましょう' (let's make it clean) is positive and collaborative, which reduces resistance.