Why do some people have no cavities (and they do not brush/floss regularly) and others are prone to cavities (and they brush/floss regularly)?
by 
Cheery Cherry
ANSWERS: 6
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heredity, plain and simple
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Genetics perhaps? Intake of sweet foods? I only started religiously brushing at 16, before that I only did occasionally and rarely got cavities but I don't really care for sweets - that may be my reason.
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different strokes different folks different genes
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It's most likely a combination of inherited genetics, how their teeth enamel formed as a child and the foods/drinks they consume now that affect the enamel. For some, it also has to do with the chemical composition and quantity of saliva they produce.
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people have different decay rates whe you are a child its very high, but when you are over 25/26 then it goes down, and up again if you are pregnant thats why the doctors etc put so much attention on tooth care during pregnancy. then when you are really old your decay rate is really low. I have little white bits on my front teeth the dentist says it was arrested decay that happens because i sleep with my mouth open:( there are some people that are just lucky :)
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Actually it depends on the type of bacteria that you have in your mouth. Some people have more of the type that cause cavities and the others have the type that cause periodontal disease. You usually end up with the type that the main care giver that you had as a child had in their mouth. Adopted kids have the type their adoptive parents had. The bacteria can be transmitted from sharing utensils, drinks or kissing. Most people lose their teeth these days from periodontal (gum) disease. Usually those people have great looking teeth. I've seen perfectly fine teeth with no speck on them fall out.
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