While not all oral health problems can be prevented, many of them, such as tooth decay and gum disease, can be prevented with good oral hygiene.
Some people think that good oral hygiene is something that they don't have time for in their busy life. But a routine that involves brushing twice a day and flossing once a day takes about five minutes out of your day. And those five minutes can prevent bacterial plaque build-up, which in turn can prevent tooth decay, limit tooth discoloration, and prevent or even reverse some forms of gum disease.
If you also visit your dentist at least twice a year, you are well on your way to preventing many problems that can start in your gums and teeth.