A Sonicare toothbrush typically lasts for around three to five years. The durability is influenced by the model, frequency of use, and how well it is maintained. Proper care, such as regular cleaning and replacing the brush heads every three months, can extend the lifespan. Sonicare toothbrushes have high-quality motors and are built to withstand daily use. The toothbrush's lifespan may vary depending on individual habits and maintenance. It's important to note that if any issues arise before the expected lifespan, it is advisable to contact the Sonicare customer service or refer to the product warranty for assistance.