Why is it important to plan things carefully?

If you don't plan ahead, anything might happen. For example, if you don't plan enough time to do your homework, you might not finish in time and get a bad grade. If you don't plan to buy enough material to make your model airplane, you might run out before you get finished - or you might get too much and waste your money. If you don't plan to take care of yourself by brushing your teeth every day, you'll get cavities and have to have all your teeth pulled out eventually and have dentures.