Kyoukaikenpo yellow card health insurance coverage

hey I want to go to dentist for a wisdom tooth cavity treatment. however I heard from my boss that the health insurance doesn't cover dental visit. It sounds weird so I assume its either my japanese was not good enough while listening to his explanation or its a misinformation from his part. I tried browsing and can't get any useful information except the AI stuff that said dental visit is covered except for cosmetic purpose. anyone know if my case will be covered by the insurance?

by ImpressiveBit1948