Thanks for replying!
QUOTE(AskTheDent @ Oct 18 2015, 10:35 PM)
1)Teeth have 3 layers, namely enamel, dentin and pulp. And it is sterile in pulp ( no bacteria ). Once enamel and dentin are breakdown by bacteria, the pulp will get infected and straight down to the bone beneath. It takes years for enamel and dentin to breakdown
What always amazes me: enamel and dentin don't break down across all teeth equally and uniformly, and not immediately beginning from the first moments those teeth broke out. Lifestyle and nutrition must be at the root, but what bothers me is that we still have no clear-cut answer on prevention. Are acidic foods the major culprit, or abrasion, any carbs or just refined sugar..
Another theory holds that normally tubules are designed to continuously regenerate dentin and enamel (just like bones constantly re-generate themselves) and malnutrition/malabsorption disturb that slowly over time. The approach being, "breakdown of enamel/dentin is normal and unpreventable, failure of regeneration is the real problem to be fixed". Well an interesting topic. Half of my fillings popped out within 6 - 24 months, most of them done in Germany. Every time a filling is done, a bit more of healthy tooth matter needs to be drilled away, so I'm very wary of getting the same fillings done every 1-2 years until most of the tooth will be completely gone another decade or so down the line.
QUOTE(AskTheDent @ Oct 18 2015, 10:35 PM)
2) In a properly placed filling, they are no way the bacteria can go underneath the filling and cause a cavity to form beneath the filling ( secondary caries ).
Very interesting, given how infinitesimally small bacteria are, I'm quite curious how we ever managed that impressive feat.
QUOTE(AskTheDent @ Oct 18 2015, 10:35 PM)
Sometimes the filling might have microcracks due to chewing, wear and tear,that can cause secondary caries
Chewing and wear and tear are 100% guaranteed for everyone on a long enough timeline, so instead of "sometimes" shouldn't it be "more often than not"?
QUOTE(AskTheDent @ Oct 18 2015, 10:35 PM)
3) Mostly the public have the idea of ' the harder i brush, the cleaner it get'. Our teeth is not toilet bowl! ALWAYS use soft toothbrush and brush in circular motion, use floss and mouthwash to maintain the oral hygiene. The abrasion on enamel is a normal occurrence of nature as we bite, chew, acidic food that we cant do much about it. It is worsen by improper toothbrush and technique
Indeed, so would be cool if the dental profession were to research somewhat deeper into how to help the body regenerate what inevitably gets broken down by real-life. Enamel breakdown may be inevitable, and yet decay isn't --- as every single skeleton (any age well into old age) older than say 100000 years ago (or simply any from today's few remaining "primitive" hunter/gatherer tribes) proves.