How do I prevent cavities in the molar teeth?

I only have 28 teeth, because I don't have the third molars. But two of my molars already had cavities, and yesterday I went to the dentist, and he noticed another cavity in my very back molar on my bottom right side, and two cavities on my molar on the bottom left side. I'm getting them filled in soon, and I'm also getting one of my top molars filled in to prevent it from getting a cavity. But I take really good care of my teeth. I brush and floss daily, sometimes I brush three times a day, and I chew sugarless gum. My teeth are really white and straight; I never even had braces because I didn't need them. All my dentists say I have good teeth, but my molars keep on getting cavities, even though I take good care of ALL my teeth. Is there any way to prevent my molars from getting cavities? Btw, my dentist said that my molars are naturally very deep.

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Use a toothbrush that the brush part is different lengths. Does that make sense? I guess I'm trying to say use one that isn't flat on top. Make sure to pay special attention to your molars when brushing, spend extra time brushing back there. Use cavity control toothpaste. Make sure you don't eat too many sweets. Good luck!

My mom is a dentist and she says that everyone is different. I haven't used toothpaste since i was 10 (i'm 16 now) and my teeth are perfect. Besides take care of them there's not much you can do

Ask if he would be willing to put sealants on the molars that don't have fillings (can't put them on the ones that do). Don't typically do this on adults & insurance won't cover, but he may be willing to. Also, ask him for a prescription for a flouride toothpaste, a good one is Control Rx which is available through Omni. The flouride, if used properly, should help prevent more decay.

Make sure you brush and floss before going to bed. Periodic fluoride treatments in the dentist's office should help. High fluoride toothpaste is available by prescription (or OTC in Canada), so ask your dentist about these.

Avoid mixing very hot and very cold foods. Avoid candy, pop, chewy and sugary foods. Avoid chewable vitamins. Don't sip citrus juices throught the day (have one or two servings instead and rinse with water afterwards). Don't brush 1 hr after acidic drinks. Chew some sugarless gum instead. Get treatment for acid reflux and dry mouth, if you have these conditions. Have a few different toothbrushes and brush several times a day always with a dry one. Discard them every couple of months. It is cheap insurance. Use several good quality, soft ones (like sensodyne) and one medium before bedtime.