Want a stronger core? Skip the sit-ups. Sit-ups once ruled as the way, Now plank exercises do, in which you assume a
position and hold it, are the gold standard for working your core. Eliminate back pain - Focus on your core.
Yet another great fruit that works also as a great teeth whitener is lemon. Lemons contain high acid level in the peel,
which is a great whitener or even bleaching agent. You can use the lemon in two different ways; use the lemon peel to rub
on your teeth or squirt the lemon juice on your teeth.