Best ways to sanitize a toothbrush is by soaking it in antibacterial mouthwash and hydrogen peroxide, cleaning it under running water thoroughly, store it in a way to air dry naturally, etc.
You should brush your teeth for maximum 2 minutes. Go for soft bristle toothbrush with a long handle and follow brushing techniques, such as Sulcular, Charter, and Stillman, while you brush your teeth.
Dentists will suggest you a soft bristle toothbrush over a hard one. Soft bristle toothbrush is gentle on your gums and more flexible. Hard brushes can damage your gums and their bristles are so rigid that they can’t clean between teeth and the crevices on your back teeth.