The fluoride in toothpaste keeps protecting your enamel after you brush, as long as it's left in place. Rinsing with plenty of water dilutes it and washes most of it away. That's why dental health authorities recommend simply spitting out the excess foam without rinsing. It's a free habit that makes every brushing more effective.
Chlorine on its own is fairly gentle. But when it combines with urine, sweat and other grime from swimmers, it forms chloramines, which cause stinging eyes and that classic 'chlorine smell'. A well-kept pool barely smells at all. Shower before you swim and never pee in the water.
Muscle mass slowly shrinks with age, putting independence at risk. But in 1990, a study had nursing home residents aged 86 to 96 train their legs for eight weeks: their strength more than doubled. Muscle responds to training at any age. Getting up from a chair without using your hands is already an exercise.