九月一日曾替一位来自美国的知名牙医做交传（香港各大报章和有线电视台到场采访），学到了不少东西。比如说，普通人的口腔里有300到500种细菌，这不可怕，关键是保持平衡。但一旦牙齿周围出现“牙周袋”（gum pockets)，那就不好玩了，因为厌氧细菌就会在这些阴暗的角落里疯长，打破口腔里的微生物平衡，牙周炎就来了。我回忆了一下，他说的一些要点如下：

Tips for keeping your teeth healthy:

(1) Oral health is key to overall health. Dental disease may be part of the cause of, or is at least associated with, diabetes, heart disease, pre-term child birth and stroke.
(2) Brushing teeth is a misnomer. One should brush the "gum line" (where the tooth meets the gum), not just the teeth. Therefore, use a soft-bristle, small-headed brush. Replace your brush whenever the bristle starts flaring (sticking outwards).
(3) If bleeding occurs during brushing, it means there's something wrong with your gum. KEEP BRUSHING THE GUM LINE every time you brush your teeth, until the bleeding stops in a few days' time. Do NOT be put off by the bleeding and be too "scared" to brush there again.
(4) You must use dental floss every day and use it thoroughly.
(5) You must see your dentist at least twice a year, for checkup and for cleaning, whether you feel there's a problem or not.
(6) If you have not seen a dentist for a while, book an appointment right away.