What can really happen if you do not brush your teeth. My brother does not brush his teeth at least not regularly but when he goes to the dentist he does not have any cavities.  Makes me wonder if brushing your teeth is really a big deal.

Answer: Your brother is just beating the odds right not but by not taking care of his dental health it will catch up to him at some point. There is nothing good that comes from poor dental hygiene.  By not brushing your teeth or by not brushing regularly, bacteria, plaque and mineral deposits will start to build up on your teeth. This will progress into causing many dental issues such as bad breath, cavities, gingivitis, gum disease, infections, loss of teeth, and yes sometimes even death.