Does minor gingivitis heal itself?

Gingivitis can be reversed. Try brushing with that crest pro health toothpaste ans using their mouthwash. It reverses gingivitis. Also, floss daily and try a warm saltwater rinse once or twice a day. If it doesn't improve or gets worse in a few weeks, see a dentist

Possibly. I had gingivitis from not flossing, and the dentist wanted to do a scaling and root planing. They scheduled me to come in about a month from the consult. When I got home I flossed every evening and used mouthwash. It was tough at first, but at the end of the month, it was routine. When I went in for the scaling and root planing, it was a piece of cake - they were surprised at how much improvement I had made in just a month. Brush, floss, and use mouthwash... Also go to the dentist regularly

Buy yourself a water-pik and use it faithfully and you will have healthy gums

No, you're going to die slowly with no teeth!