For 6 months I took Asertin. Now I have stopped and my gums started bleeding - is this normal and how long can it last?

Theoretically, Asertin can cause blood vessel dysfunction (e.g. bleeding), but this is an adverse reaction described as rare and occurs during treatment rather than after completion. I suggest you consult a specialist (dentist) who will assess the cause of bleeding. Bleeding gums is also an indication for changing oral hygiene preparations - it is worth using soft toothbrushes that will not additionally irritate and pastes dedicated to sensitive teeth and gums, such as Elgydium Sensitive (whitening agents should be avoided). I also recommend lotions for sensitive oral hygiene, such as Baikadent (link below - on our website you can compare prices and place an order with home delivery or collection at the pharmacy). https://www.gdziepolek.pl/produkty/8785/baikadent-mietowy-plyn-do-pielegnacji-jamy-ustnej-plyn/apteki https://www.gdziepolek.pl/produkty/107423/elgydium-sensitive-pasta-do-zebow-wrazliwych-pasta-do-zebow/apteki You can read more about it here: https://www.gdziepolek.pl/kategorie/stan-zapalny-dziasel