The frequency of changing a razor blade can significantly affect the quality of your shave. Generally, it is recommended to change the blade every five to seven shaves for optimal performance. However, personal factors such as hair thickness, shaving frequency, and skin sensitivity may influence this timing. If you notice any tugging or pulling during shaving, or if the blade feels dull, it is a sign that it is time to replace it, regardless of how many shaves you have completed. Additionally, keeping your blades clean and dry can help prolong their lifespan. For further information, tips on blade care, and recommendations specific to various Gillette products, it would be beneficial to check out the resources available on their official website.