Place the toothbrush against the teeth at a 45-degree angle to the gum line.

Tartar that develops above the gum line can be especially serious.

Pay particular attention to your gum line, because this is where gingivitis takes hold.

She struck it with her rock at the gum line.

Often a notch can be felt at the top of the tooth, just below the gum line.

"A little groove goes up the gum line," she says.

The man's front teeth had been broken off at the gum line and the stumps were a dark brown.

Promise me now, or I bust those teeth off at the gum line.

Most of his front teeth had been broken off at the gum line.

Keep the tips of the bristles against the gum line.