Teeth can be damaged over time through normal wear and tear, but certain habits and foods or drinks accelerate this damage. The document identifies 5 habits that badly damage teeth: not brushing properly, consuming acidic or sticky foods and drinks, clenching or grinding teeth, smoking, and chewing on hard objects. It advises regular dental checkups and proper brushing and flossing to prevent teeth problems and protect dental health. Contact information is provided for a dental hospital in Kolkata, India that provides checkups and more details.