There are 28 teeth total in the human mouth, organized into four types - incisors, canines, premolars, and molars. Incisors are the front teeth used for biting. Canines are next and are sharp, used for tearing food. Premolars are behind the canines and aid in chewing and tearing. Molars are the back teeth and are mainly used for grinding food. Proper dental hygiene includes brushing twice daily, flossing, drinking water, and visiting the dentist regularly.