Scrape tongue, brush teeth & massage gums. floss teeth and drink water reg; why does tongue begin to turn white and spit begin to smell sour after 2-3 of brushing/oral care? is normal or is my breath stinking already? happens even when eat nothing?

Your oral hygiene as noted is good, but does not always effectively treat gum infections. See a dentist for an exam and a referral to an endodontist.

Your oral hygiene programs has a 2 huge omissions. You didn't mention cleaning between your teeth, the 35% of tooth surface that a toothbrush can't reach. Not flossing or using a WaterPik daily = gum disease (infection) between teeth. The other omission is twice a year dental examinations/professional cleanings. There are good and just reasons for both. Please see a Dentist ASAP.