From the end of the 19th century to the beginning of the 20th century, some scholars advocated linking negative ions with human health. With the promulgation of Japan's 2003 "Prevention of Inappropriate Advertising" regulations, manufacturers can no longer claim that these claims are unsubstantiated. Compared to these effects that have not yet been scientifically proven, negative ions are actually more related to static electricity.
 
Hair that has been "exploded" by static electricity will become very fragile in autumn and winter, and the negative ion comb has a built-in negative ion generator, which turns on the device when combing the hair, so that the negatively charged ion particles neutralize the positive charge in the hair, eliminating static electricity, thereby smoothing the messy hair and making it fit smoothly. At present, the more well-known brands in the negative ion comb market are Philips, Braun and Panasonic, Philips is fashionable and portable, and has a good grip feel, easy to comb and tie knotted hair and does not consume electricity, occupying the first place, and the overall cost performance is higher.
 
Philips anion comb has a variety of models, each model has the same function, but the matching comb teeth or appearance pattern is slightly different, the price ranges from 199 yuan to 359 yuan, the comb teeth are removable, and the cleaning is convenient. Models above 259 yuan, such as HP4675 and HP4676, are equipped with two kinds of tooth combs, which are smooth and delicate and tight, with different lengths, which help to comb tangled hair; The massage combs are thicker and have micro massage fingers at the top. The 199 yuan models such as HP4722 and HP4588 only have a universal round comb. From the point of view of the curvature of the tooth pad, Braun's arc and tooth spacing are larger, which is not as good as Philips in terms of combing effect, and it is easier to pull hair out in actual use.
 
Philips negative ion comb has a variety of shapes such as Chinese elements, romantic cherry blossoms, and fresh macarons, and also cooperates with Disney to launch the Frozen theme children's hair comb HP4590. Philips negative ion comb is small, portable to go out, and the grip feels good, the fly in the ointment is that the battery can be used, install 1 No. 7 battery, according to the use of 2 times a day, about 2 minutes at a time, can be used for about 4 months.