Its always good to keep up! If you don't, all of your enamel is destroyed, teeth fall out, gingivitis and an infection can spread in your gums. Plus, not to mention bad breath.
Good for health, to avoid sickness
Sometimes its the things you eat. For example you can eat garlic and brush your teeth, but still have bad breath due to the garlic.
you can have good hygiene by: Bathing regularly,brushing your teeth regularly,by taking care of your nails and hair
i m not sure but i think is ur body in a good condition like brushing ur teeth , cleanig ur clothese and etc- I hope this was helpful (:))