The chewing gum with xylitol Miradent are a good alternative to normal gum - although that should be sugar-free anyway. However, it has after about 10 minutes only a tasteless piece of gum in your mouth. And if you have a hot drink while chewing, eg tea, the rubber is unpleasant liquid.
The gums are just right for a short burst of freshness in the mouth - for longer employment they are nothing.