Best dentist in Adambakkam | How Often Should You REALLY Replace Your Toothbrush? Your toothbrush may look fine, but it loses effectiveness over time. Dentists recommend replacing it every 3 months or sooner if bristles fray. Old brushes can’t clean properly and may even harbor bacteria. After an illness, always switch to a fresh toothbrush. Using worn bristles can lead to plaque buildup, cavities, and gum problems. Choose a soft-bristled toothbrush to protect enamel and gums. Electric brush heads should also be changed every 3–4 months. At Dr. Akkshaya Dental and Aesthetics, Adambakkam, we guide you on the right oral care tools. A simple swap can make a big difference for your smile.