Tea tree is known for being antifungal, antibacterial, anti-inflammatory, and astringent, but how does this promote scalp health? It helps decrease dandruff which can be a symptom of fungal issues while also helping fight bacterial infections that can cause acne. Not only will tea tree help calm your scalp, but the astringency can help regulate sebum production; overproduction can clog follicles, stunt hair growth, as well as make your hair appear more oily while too little sebum can cause a dry and itchy scalp. With an added note of citrus, your hair and nose will thank you for using this shampoo bar.