You should not be worried!some small caries won’t be evident In X-ray s, May be in clinical examination it show as pits.and fissures(grooves on teeth)
You should get it filled by dentist as soon as possible,also maintain a good oral hygiene, brush twice daily.
Next Steps
Visit a good dentist, and all the cavities should be filled as soon as possible.
Health Tips
Do scaling of teeth regularly,twice in a year(6months).or atleast once in a year.