The
efficacy of chewing gum is probably due to the effect of
salivation, combined with the cleansing effect of mastication.
Any gum will do, but it should be sugar free gum for your teeth's sake.
Chewing gum has its downsides. Firstly, excessive chewing can
cause distress for your Temporo-mandibular Joint, leaving you with a sore
jaw. It is also thought that chewing gum gets your stomach all excited and prepared for
food, possibly leading to stomach problems. To avoid these problems, you
should chew gum for a minute or
two at a time.