Dental chews scrub the surface. Gum disease starts beneath the gumline. Wrong place.
Brushing works — if done perfectly, daily, reaching the gumline, on a dog that cooperates. Miss one day and plaque is already hardening. Wrong consistency.
Professional cleanings cost $600–$1,500. Buildup returns within 24 hours. You'd need one every month to actually prevent what I'm describing.
Every product you trust is fighting this in the wrong place, at the wrong time, in the wrong way.
And every day it's not being fought where it actually starts — the disease is advancing.