Use infrequently and only as needed to maintain a bright smile. Over brushing hurts both the soft and hard tissues, resulting in recessions and toothbrush abrasions. Care of the mouth is a delicate balance between over and under brushing. Remember to brush the teeth but not the gums. Rinse thoroughly with water immediately after brushing.
Water is preferable, but any rinse is better than no rinse at all.
Use a toothbrush or any device, including floss, if necessary, to remove food particles left in the mouth after eating. Be careful not to hurt the gum. Don't saw with the floss. Food debris encourages growth of unwanted micro-organisms. The brush is supposed to wear out so that you don't.