What causes cavities?

I visited Manipal Hospital last month for a dental checkup, and the doctor explained that plaque buildup from sugary foods eats away the enamel. They advised me to get a professional cleaning twice a year. Please consult a qualified dentist to get your teeth checked rather than trying online fixes.

Personally, I noticed I started getting cavities when I was constantly sipping sweet tea throughout my office shifts. Once I cut down on sweet drinks and started brushing twice a day, my tooth sensitivity improved a lot. That is just what worked for me, though.

Cavities are simply caused by food particles getting stuck between teeth, which bacteria feed on to make acid. Instead of spending thousands on dental fillings later, just buy a good fluoride toothpaste and brush before bed. It is a very cheap and highly effective habit that everyone in the family should follow.

I brush twice a day and still got two new cavities at my last checkup, which makes me feel so anxious and frustrated. Does anyone else feel like their genetics just make their teeth weaker, or am I doing something wrong with my cleaning routine?