Canadian scientists believe the polyphenols can block production of free radical molecules, high levels of which can damage gum tissue.
However, dentists warn there are other risks associated with drinking wine, and people should not think it was good for their teeth.
The Canadian study suggests polyphenols stop free radical production by subtly changing the make-up of proteins within the cells that control their release.
Periodontitis destroys gum tissue and is a leading cause of teeth loss, affecting millions worldwide.
It is thought to be important to keep free radicals at low levels to maintain healthy gums, otherwise they can inflict damage on the tissue.
Previous studies have suggested that the polyphenols in red wine may help to cut inflammation, and possibly the risk of both cancer and heart disease.
UK experts said polyphenols might prevent the inflammation getting worse - but were doubtful about their ability to block inflammation completely.
block：動詞，妨礙，封鎖。例句︰Many roads were blocked by the police in a big fire. （在一場大火中，警察封鎖了許多道路。）block當名詞時，指塊狀物，（兩條道路之間的）街段、街區。如three blocks away （位在三條街外）。
make-up ：名詞，構成、性情。例句：Do you know the makeup of the atom?（你知道原子的結構嗎？）
inflict ︰施加（打擊、傷害、懲罰等）。例句：Don't inflict your ridiculous ideas on me!（不要硬要我接受你那可笑的想法！）