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Baum and his  acidicaquariumcolleaguescurrentecosystemsfuturepotentiallyrootseparatevisible analyzed 42 teeth from 10 blacktip reef sharks at an  acidicaquariumcolleaguescurrentecosystemsfuturepotentiallyrootseparatevisible in Germany. They placed the teeth in two  acidicaquariumcolleaguescurrentecosystemsfuturepotentiallyrootseparatevisible water tanks for eight weeks. The salt water in one tank had a pH level of 8.2, which is similar to  acidicaquariumcolleaguescurrentecosystemsfuturepotentiallyrootseparatevisible ocean averages. The water in the other tank was more  acidicaquariumcolleaguescurrentecosystemsfuturepotentiallyrootseparatevisible, with a pH level of 7.3. Baum found that the teeth in the more acidic water had " acidicaquariumcolleaguescurrentecosystemsfuturepotentiallyrootseparatevisible surface damage". This included cracks and cavities, increased  acidicaquariumcolleaguescurrentecosystemsfuturepotentiallyrootseparatevisible decay, and structural deterioration. He said ongoing damage could impact how sharks feed in the  acidicaquariumcolleaguescurrentecosystemsfuturepotentiallyrootseparatevisible. Such damage could  acidicaquariumcolleaguescurrentecosystemsfuturepotentiallyrootseparatevisible trigger "domino effects" across the health of many marine  acidicaquariumcolleaguescurrentecosystemsfuturepotentiallyrootseparatevisible.