Is it possible to get dental cavities even if you brush 3-4 times a day, floss and use mouthwash?

Yes : It is still possible to develop cavities but there will be fewer than if you didn't do those things.

Yes it is: Brushing, flossing, mouth wash will lower your probability of getting dental decay compared to if you were not doing these things. You may still get cavities if you are naturally predisposed to getting cavities, have a mouth that is very dry, or eat lots of sugar items.

Yes: Your disposition to dental decay depends on many factors. Certainly good oral hygiene habits play a major role in prevention. However, there are other factors to consider, including the condition of your teeth, immunity, diet, salivary flow and composition, excessive function (grinding/clenching), and overall genetic makeup.

Yes: Your diet is an important factor in getting cavities.. Diets high in sugars and acids will cause cavities. Patients with dry mouth have a greater chance of decay.

Very possible: Some people have terrible hom care and get no cavities, while others practice super dental hygiene and just keep on getting decayed teeth. Saliva makeup, diet, proper brushing, flossing...try your best. You might try some of the anti-plaque and/or fluoride rinses