Air purifiers in cities like Delhi-NCR are no longer a luxury. But as their importance has grown, so has their availability. One of the latest in the market is the Philips Smart Air Purifier AC 4221.

It’s not that I’m against the wonders of modern technology, but I’m a firm advocate in the idea of “If it ain’t broke, don’t fix it.” Which is why I’d never used an electric toothbrush before testing ...