Oral-B 3D White Advanced Failed to Whiten My Teeth — No Results After Weeks of Use

I purchased the Oral-B Pro 3D White Advanced Express Whitening toothpaste from the Gratis store in Biga. I used the product regularly twice a day, almost until it was finished. However, I did not notice any whitening or any other positive effect on my teeth—it was completely ineffective. I bought it trusting the claims on the packaging such as “bright white” and “whitening,” but I did not see any benefit at all.

I expect an explanation from the brand regarding this issue. Do results differ from person to person, or is it normal for the product not to deliver the whitening effect it promises? I feel like I bought it for nothing and did not get my money’s worth.