I use waterpik,floss,tongue scraper,interdental brush,fluoride toothpaste everyday, dental checkup every 6 months and still get cavities eventho i dont know how i can be more thorough with cleaning my teeth.. my teeth are a little thin. pls advice?

Your dentist who has seen you frequently will be the best doctor for the advice. Good luck.

Have you tried an OTC fluoride mouthwash? You may want to consult wit a specialist in Oral Medicine and/or a specialist in Oral Pathology. Your local Dental Society should be able to help, Additionally you diet may be problematic. Discuss this with your Dentist.