This mini review investigates the development and performance of sustainable bacteria-based selfhealing concrete and mortar, utilizing various microorganisms such as Bacillus Sphaericus and Bacillus subtilis to enhance mechanical properties and achieve autonomous crack repair. Several studies explore the impact of different bacterial concentrations and curing conditions, including freshwater and sulfate-rich environments, on the compressive, tensile, and flexural strengths of concrete. The incorporation of steel fibers and polyvinyl alcohol (PVA) fibers in conjunction with bacteria is also examined to highlight their combined effect on long-term strength and self-healing efficiency. The primary mechanism of self-healing is identified as microbial induced calcite precipitation (MICP), where bacteria facilitate the production of calcium carbonate (CaCO3) to seal cracks. This process is validated through Scanning Electron Microscopy (SEM) and Energy-Dispersive X-ray Spectroscopy (EDS) analyses, which confirm the formation of CaCO3 precipitates in cracked specimens. Other analytical techniques such as Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) are employed to analyze the chemical and crystalline phases in the bio-modified concrete and mortar, confirming the presence of calcium carbonate and alterations in hydration products. The available literature highlights the significant improvements in long-term mechanical strengths achieved through bacterial incorporation, with some studies reporting substantial increases in compressive, tensile, and flexural strengths. Furthermore, the studies demonstrate the potential of bio-concrete as an eco-friendly alternative to traditional cement, reducing the carbon footprint associated with cement production. While these findings are promising, the research also acknowledges the need for further investigation into the long-term durability of microbial-treated materials under diverse environmental conditions and the economic feasibility of large-scale applications. Overall, these studies underscore the potential of microbial intervention in creating more durable, sustainable, and self-healing construction materials. 1 Mechanisms of Self-Healing Concrete Self-healing concrete is an innovative and eco-friendly approach that allows concrete to automatically repair cracks, potentially reducing maintenance costs and extending the lifespan of structures. This is achieved through self-activated repair mechanisms that can be particularly beneficial in environments with limited human intervention - Self-healing in concrete can occur through two main types of mechanisms: autogenous and autonomous. Autogenous healing is the natural ability of concrete to seal cracks, typically involving the further hydration of unreacted cement particles or the precipitation of calcium carbonate from dissolved calcium hydroxide reacting with carbon dioxide. Autonomous healing, on the other hand, involves the incorporation of a healing agent into the concrete matrix that is released upon crack formation to facilitate repair. A prominent method for autonomous healing involves the use of microorganisms, often bacteria, capable of inducing calcium carbonate precipitation. This process is known as microbially induced calcite precipitation (MICP) - and agar plate media, incubated at 30°C, and standardized to a concentration of 10 9 cells/ml - . The studies found that both fresh and sulfate water curing conditions led to increased compressive strength with the inclusion of bacteria, highlighting the beneficial impact of bacterial activity on the material's structural integrity even in harsh environments. For instance, in sulfate-rich water, concrete specimens exhibited increasing compressive strength at 180 days from 47 MPa for 0 % bacteria to 77 MPa with 2.5 % bacteria content. Despite a lower initial strength at 7 days, bacterial incorporation resulted in significant strength improvements over time . Fig. . Self-healing concrete systems .