If you don’t brush or floss regularly, bacteria from plaque on the teeth infect the gums, causing them to become swollen and bleed. Over time, the gums turn white and start to recede.

Bleeding gums don't make for a happy mouth, so here are some tips to get you smiling again. First, figure out the cause. Many cases stem from too much plaque buildup, which you can tackle at home.

New research suggests that while vaping can increase plaque and inflammation, its effects on gum disease remain unclear. Should vapers be worried? Here's what the latest science reveals.