Visit dentist for clinical examination. Do professional teeth cleaning (ultrasonic scaling) every 6 months. Its completely safe and painless procedure.
Next Steps
"10 Dental Commandments for Happy Teeth!" by Dr.Rashmi Bamane - https://www.practo.com/healthfeed/10-dental-commandments-for-happy-teeth-40426/post
Health Tips
"Side Effects of Wrong Tooth Brushing" by Dr.Rashmi Bamane - https://www.practo.com/healthfeed/side-effects-of-wrong-tooth-brushing-40067/post