are often told to have a mirror in front of them to see their own facial expression whilst talking with a customer. I guess if you can see yourself you prefer to look nice and smiling and that is transmitted down the phone line.

On the question of whether flashing a set of white gnashers is the key to being the winning candidate at an interview. I can honestly say I have never failed an interview in my life (I've had many different jobs and always the same teeth!). Was it because I smiled? Well I'm sure I did, but I'm equally sure I wouldn't have got the jobs on that basis alone - it must have had more to do with other attributes ;o)

Oh! And I've even been accepted by American Corporations too, despite not having unnaturally whiter than white bright teeth :D