Our teeth are extremely hard, and are very resistant towards heat, force and hard objects. But teeth can break, and they all too frequently become loose, chipped or otherwise damaged. While bones do become brittle over time, I want to make it absolutely clear that teeth do not, on their own, become weaker. We cause them to become damaged and weak, and often with activities we would never even dream of. These are some of the bad habits which cause damage to your teeth: