The formation of deep fissures is common in teeth. If bacteria continues to find their way below the gums, they increase. These cracks can’t be cleaned using a toothbrush as they’re so small. When the fractures begin to grow downwards, it gets harder to scrub. If they’re left untreated for long enough the possibility of developing cavities. One of the methods by that you can prevent the formation of cavities is to fill the fissure, and that’s why dental sealants can be found. The fissure is covered and then sealed up to ensure that bacteria cannot get inside. a5nee81xoh.