Compléter Tooth partsVersion en ligne Complete par Mª Ángeles Martín 1 gums substance dentin cells periodontal pulp part ligament tooth Blood pulp enamel teeth through firmly teeth tissue cementum The is the hardest , white outer of the . The is a layer underlying the enamel . It is made of living , which secrete a hard mineral . The is the softer , living inner structure of . vessels and nerves run the of the teeth . The is a layer of connective that binds the roots of the teeth to the and jawbone . The is a tissue that helps hold the tightly against the jaw .