①Blind pit
It is a degenerative feature of teeth, observed in 30-40% of Japanese individuals.
②Oblique notch
③Incisal tubercle (Mamelon)
When the tooth first erupts, three mamelons appear in a row, but over time, they wear down and disappear within a few years.
④Distal marginal ridge
⑤Cusp tip
⑥Basal tubercle
Near the cervical region, the marginal ridge gradually rises to form a basal tubercle.