The shape of your teeth influences your risk for cavities. Deeper crevices and pits in the top surface of teeth make people especially vulnerable to decay. If your teeth have large valleys, you might want to consider sealants. These are plastic coatings used to seal off biting surfaces from cavity-causing bacteria. Make sure to check with your dental coverage provider to find out if sealants are covered under your plan.
Another genetic factor is enamel strength. Tooth enamel works to protect the inner layers of teeth from decay. Depending on your genetic makeup, your enamel may be naturally harder or softer than average. The softer your enamel, the more easily it can break down to form cavities.