That ‘square-jawed’ look is usually the result of overdeveloped masseter muscles: they are the muscles that are attached at the angle of your jaw and control your chewing. If you tense them a great deal – or grind your teeth – they become more pronounced and produce that firm, masculine jawline.

Many men and women suffer for years clenching or grinding their teeth; it’s an involuntary movement which we cannot control. 70% of grinding and clenching happens at night when we sleep (ask your partner/spouse) or watch TV while driving the car. We don’t realise it; the majority of my Bruxism patients (who clench and grind ) deny it, as they have no awareness of it.

Wide or square jaws can be inherited genetically or due to excessive clenching/tensing of the jaw muscle. Individuals with bruxism and clenching of the teeth are at increased risk as well.