When plaque builds up on your teeth, it can cause decay if it’s not removed regularly through brushing and flossing. Plaque can be hard to see so the best way to avoid it is through best practices for dental care.
Make sure you brush after meals with a soft-bristled toothbrush and use floss. Never substitute mouthwash for brushing since a rinse is not enough to remove plaque. And of course, see your dentist twice a year for a professional cleaning.