Flossing.
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Flossing is an essential part of any oral health care routine. It helps remove plaque from between your teeth, in areas that the toothbrush can't reach, and it helps prevent gum disease and dental decay. Plaque that is not removed with thorough daily brushing and cleaning between teeth can eventually harden into calculus or tartar.

That's why dentists advise  to use flossing once a day before bedtime.

When I use floss I find that I hurt my gum , how can I avoid it?

If you've recently started using the floss  is natural that your gums bleed.
After you use the floss for a week, you will find that the bleeding has stopped.
And you'll find yourself in the right direction towards a healthy  teeth and gums .

There are two types of dental floss: 

Nylon (multi-threaded): This threaded are available waxed  non-waxed , with different flavors. Since it is a composite of several strands of nylon, they sometimes rupture or torn  quickly, especially between narrow zones teeth.

The PTFE   (single-threaded): are more expensive than nylon, and are easy to use and move between the teeth until the narrow zones teeth, they are very practical and tear-resistant.