Hamish Worgan has written:

'Gum bichromate printing process'

A bichromate is another term for a dichromate, a salt of dichromic acid.

Robert Bunsen and Johann Poggendorf.

Yes Gum chewing does actually help stimulate the brains thinking process Because for most people if they are chewing Gum while taking a test,they are calmer then they would normally be without the Gum.

Best not to chew gum during treatment. Pieces of the gum can wedge themselves into spaces between the wire and your gums and cause lots of discomfort. The object here is to straighten your teeth, and chewing gum will not help the process one bit.