Instead of having a pulp cavity, each tooth has a cluster of thin, hexagonal, upright, parallel tubes of vasodentin (a modified form of dentine), with individual pulp canals, held together by cementum.
ɪnstˈɛd ʌv hˌævɪŋ ɐ pˈʌlp kˈævᵻɾi, ˈiːtʃ tˈuːθ hɐz ɐ klˈʌstɚɹ ʌv θˈɪn, hˈɛksɐɡənəl, ˈʌpɹaɪt, pˈæɹəlˌɛl tˈuːbz ʌv vˈæsoʊdˌɛntɪn ɐ mˈɑːdᵻfˌaɪd fˈɔːɹm ʌv dˈɛntiːn, wɪð ˌɪndᵻvˈɪdʒuːəl pˈʌlp kənˈælz, hˈɛld təɡˌɛðɚ baɪ sᵻmˈɛntəm.