NO! This is a myth, which came about from the surface of the teeth being slightly cleaner in pets fed dry food. Typical dry food does not protect against periodontal disease. This relates to the root cause of periodontal disease, which is subgingival plaque (plaque below the gumline). Supragingival (above the gumline) plaque accumulates and causes local changes in the gum tissue that allow attachment and growth of subgingival bacteria, however after this has occurred; supragingival plaque has little to no effect on periodontal disease. Traditional dry foods break apart at the tip of the tooth and have little to no dental benefit.
There are specially formulated and processed dental foods that effectively clean a pet’s teeth as the pet chews and are an excellent adjunct to routine tooth brushing. Look for the VOHC Seal of Acceptance on the dental food you choose.