The size and shape of a person's teeth make a strong impact on the subconscious mind in making an assessment of that person when you first meet them.
Cosmetic dentist Dr Christian Coachman said that the studies have shown that it is virtually instantaneous and before the info reaches the visual cortex in brain, people subconsciously make a list of conclusions about them and then respond accordingly.
According to cosmetic dentists, models, film stars and even politicians take help of their smile to shape their public image, which is the reason why many undergo cosmetic procedures to give them the impression that they want, Stuff.co.nz reported.
Cosmetic dentist Dr David Dunn said that square teeth give a masculine impression, asserting that Halle Berry's square-shaped teeth can give the impression that she is in control, relatively unemotional and calm, as well as diplomatic, objective and entrepreneurial.
In comparison oval teeth, signals sadness and pensiveness about life, as well as giving the impression a person is organised, artistic and possibly timid in personality.
Four personality types are linked with people's teeth: sanguine or dynamic (triangular-shaped), choleric or strong (rectangular-shaped), melancholic or sensitive (oval-shaped) and phlegmatic or peaceful (square-shaped).
Many people are a combination with a mixed group of different shaped teeth, so they give off a range of messages.
Sydney psychologist Janine Rod said that if she were to rank all the factors that go into creating a likable personality, she would place a friendly smile at the top of the list.
She added that a warm, authentic smile communicates feelings that words alone are unable to accomplish.