Why are Sealants important?
The natural crevices and grooves on the chewing surfaces of primary and permanent molars trap food and debris, thus promoting a hiding place for bacteria to form acidic biofilm which might increase the risk for cavities. Similar to sealing a patio deck to protect the wood surfaces, sealing groovy tooth surfaces with a dental material has been proven to help prevent cavities. The AAPD approves the placement of pit-and-fissure sealants as an integral part of the patient’s overall caries/cavity management.
https://www.aapd.org/globalassets/media/policies_guidelines/g_sealants-re.pdf

https://www.childrenschoicedental.com/treatment/dental-sealants

https://www.viennafamilydental.com/faq/are-dental-sealants-kids/18629
How are sealants applied?

https://www.drlinger.com/dental-sealant-charlotte