Before applying warm or hot water to a client's hair or skin, where should the temperature be tested?

Testing the temperature of warm or hot water on the inside of your wrist is the best practice because this area is sensitive and closely resembles the skin type of clients. The wrist is generally more responsive to temperature changes and can provide a more accurate indication of how the water will feel on the client's skin. This method ensures that the temperature is safe and comfortable, minimizing the risk of burns or discomfort for the client.

In comparison, other areas, such as the back of the hand or the palm, may not provide as accurate a sensation of heat or cold, as they can tolerate higher temperatures due to thicker skin or inherent protective mechanics. The tip of the fingers, while sensitive, may not represent overall skin sensitivity in the same way as the wrist, which could lead to an inaccurate assessment of water temperature for clients.