Hello what you're already doing is absolutely perfect, the toothpaste could be any but just a pea size, what really matters is the technique of brushing and reaching all area of the mouth. An up & down or circular motion would be apt for brushing along with inclining the brush to clean the inner surface of the teeth.
Vit C is helpful in making the gums stronger protecting from getting any gum disease such as gingivitis.
Fennel seeds increase the salivation in the mouth which in turns prevents the formation of decay , you can continue to do it but ensure you gargle after every meal to have nothing left behind of stuck in the gums or teeth.
Brushing twice and flossing with regular gargles is more than enough. You could use a mouthwash, free of alcohol diluted with water in the ratio 1:2 .
Next Steps
Continue oral hygiene measures.
Health Tips
Can get your oral health checked once in every 6months.