New diagnostic and therapeutic tools combining nanotechnology have been developed in recent medical research, which are beneficial to the specific transport and absorption of drugs and contrast agents to the brain, as well as promoting the regeneration of damaged neurons to limit or reverse neurological disorders. As a common neurological condition, dementia affected 46.8 million individuals globally in 2015, with that figure expected to rise to 131.5 million by 2050. Early identification is critical for efficient treatment of AD since neuro invasiveness and degenerative changes begin before the onset of symptoms. To detect and identify amyloid plaques, most investigations use magnetic resonance imaging (MRI) using contrast-doped NPs or tagging NPs with fluorescent probes. To combat neurodegenerative disorders, nanotechnology can be applied into neuroscience.