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Is this true and is there any evidence to support their claims?
Your question is a bit ambiguous.
If you are asking about chewing gums which clean your teeth while you chew, then yes, this is true and has been proved scientifically in various research studies. Also the ingredients from these chewing gums make your teeth more resistant to decay.
However, chewing gums offering whitening and similar cosmetic results have so far, not been substantiated by any research. Thus it is very difficult to comment about the same.
yes it is true many gums helps whitening and cleaning teeth
xylitol is a subs which partially whitens tooth.... besides chewing gum is like mechanical cleansing and helps clean food lodgement
True. Because chewing gums remove the plaque and chewing cause much saliva to pour in to the mouth which enhance cleaning process.
Dear, Amal ,,,It is difficult to say that is a true but , it may be help to remove the dental plaque and some of the food staining ,not all ,,,finally this is depend on the good type of the chewing gums and we must not depend on it to prevent dental decay.