メンゴ、20%やったな、2時間から4時間や。
Insert the tray in your mouth and lightly tap it to adapt the sides to your teeth. Wear time depends on which concentration of Opalescence you use.
•Opalescence PF 10%: 8–10 hours or overnight
•Opalescence PF 15%: 4–6 hours
•Opalescence PF 20%: 2–4 hours
•Opalescence PF 35%: 30 minutes

If you experience any significant sensitivity, stop your treatment and talk to your dentist.