Day or night, many of us grind or clench our teeth, and don't even realise we're doing it. Here are three questions to ask yourself. At least once a week, do you: feel sore in your temple, face, jaw, or near your ear? have pain when you open your mouth or chew? feel your jaw lock, click, or become stuck? If you answered "yes" at least once, you may be grinding or clenching your teeth (known as bruxism ). So why do we do it? And is there any way to stop? Let's take a look. What happens when you