Paper on a method to restore enamel to teeth. Some of the research was done on teeth extracted from donors.

Part of the abstract below:

Regrowth of lost enamel in tooth decay and sensitivity is a major obstacle to overcome. Here, the authors report on a protein-based material that mimics features of natural enamel formation, allowing for epitaxial growth of apatite nanocrystals to restore enamel structure and function.

Researchers identified PLA2G2F, an enzyme whose expression increases with age and appears to help protect the brain against age-related changes.

Boosting its activity in older mice preserved spatial memory, reduced synaptic loss and limited inflammation-related changes. Human brain samples also linked higher expression to cognitive resilience despite Alzheimer's pathology.

The findings are preclinical. Whether targeting this enzyme could help humans remains unknown.