Does Crest Prohealth really get rid of gingivitis in 4 weeks?

If I floss my teeth twice a day, brush my teeth 3-4 times a day with Crest Prohealth, rise my mouth with warm salt water two times a day, and rinse my mouth with 2 times a day with mouthwash will my gingivitis go away? Do I absolutely have to visit my dentist for this to work or will it actually work on its own? I just want to get this done before my next dentist appointment in a few months. Thankyou :).