Final answer:
Biofilms and bacteria from water can enter the oral cavity during dental procedures, leading to infections. Biofilms are difficult to eradicate and can cause dental plaque and colonize medical devices. It is important to prevent their formation.
Step-by-step explanation:
Biofilms and bacteria found in water from municipal lines can enter the oral cavity of a patient during routine dental procedures. Biofilms are microbial communities that colonize various surfaces, including the surfaces of our teeth. They can cause dental plaque and colonize medical devices, leading to infections. Biofilms are also resistant to most methods used to control microbial growth, including antibiotics. It is difficult to eradicate biofilms once an infection is established, making it important to prevent their formation in the first place.