Dr. Jeffery Martin, a dentist from Pontiac Michigan, speaks about dental sealant for children. Dental sealant can last couple years and could help kids from being exposed to teeth cavity. Dr. Jeffery Martin explains that toothbrush bristles or even flossing that hasn't been done carefully by kids may not be able to completely remove food from those areas. Dental sealants in this case may help protect against these types of cavities.br Dr.