Colgate Max White Purple Serum 40ml

The primary distinction between the Colgate Max White Purple Serum and the Max White Ultimate Pen lies in their format and volume. The Serum offers a significantly larger 40ml supply, suggesting it is intended for longer-term use or more frequent application compared to the compact 2.5ml Pen. While both products share the core function of teeth whitening, the application method differs considerably: the Serum is typically used as a daily treatment, whereas the Pen format is often favored for portability and quick touch-ups. Consumers prioritizing a greater quantity for sustained treatment will find the Purple Serum more economical, while those needing on-the-go convenience might prefer the discrete Ultimate Pen.