Brushing twice a day should be made a habit and is very important. Brushing at night after dinner is very important to prevent cavities
. Try flossing your teeth once daily if you can. Also learn proper brushing technique from a dentist
or you can also search for it on you tube.
Avoid sticky carbohydrates like chocolate, sweets etc.
Rinse your mouth with water whenever you have these kind of stuff.
Go for dental check up every 6 month or an year.