Tooth decay does not distinguish between gender and age, as long as we do not pay attention to oral hygiene, tooth decay can occur in children as young as a few years old and as old as several dozen years old. As long as the oral hygiene is not good enough, tooth decay may happen at any time. Nowadays, many elderly people do not pay attention to oral hygiene, even many elderly people have not cleaned their teeth, and many elderly people wear dentures in their mouths and do not pay attention to timely cleaning after meals, in this case, tooth decay will easily occur. Therefore, the prevention of dental caries should start from the cultivation of good oral hygiene habits. The key is to brush your teeth well, brushing is the most effective and simple way to prevent tooth decay. After eating, you should rinse your mouth in time to avoid residue of food in the mouth and breeding bacteria; you should also go to the dental hospital for examination regularly, and once tooth decay occurs, you should treat it in time to avoid getting more and more serious and injuring the dental nerve.