The build-up of plaque and tartar (especially when gum pockets have developed) will lead to teeth and bone loss. It’s important to treat this early to avoid expensive surgical procedures.
For mild gum diseases, deep cleaning might be enough to solve the issue. The dentist will scrape off the tartar and plaque from the tooth and root surfaces. This is to prevent further plaque build-up and bacterial proliferation.
In many cases that’s already sufficient because the gums will naturally heal and gradually attach themselves on the healthy teeth. One or a few more visits may be required to ensure the problem is solved.