Dr. Shadi has angelic hands! I was very anxious about going to the Dentist, but soon realized i had no reason to be. I got a filling and the Doctor had a gentle touch. I also had a cleaning done which was very thorough. Would highly recommend her!
Fillings, unfortunately, can't be whitened with the whitening strips you are using. The hydrogen peroxide would be ineffective on them, same as if you had any crowns. Fillings can change color over time with darkened foods and beverages like coffee, tea, red wine, soy sauce, etc. If this is something you are insecure about then the most conservative way to address this would be letting your Dentist know and having the fillings replaced. The Dentist can replace your fillings with composite (filling material) that can be very natural and mimic the same shade as the rest of your tooth.