Yes it can! This can depend on your routine, your lifestyle or even your external environment. For example, you might have joined the course with high porosity, damaged hair. However, overtime, as you incorporate more good practices into your routine, you may find that your porosity changes and becomes medium porosity instead. If you aren't careful, you could even find your hair becomes low porosity too, which is not ideal! Therefore, this is why it is super important to monitor your hair and any changes you notice to ensure you are caring for your hair correctly at all times!