How often is it advisable to change a phone screen protector?

A: The replacement cycle of a mobile phone screen protector depends on usage and the quality of the film: ① For ordinary low-priced films (under 20 yuan) : The oil-repellent layer wears out within 2 to 3 months, and scratches and warping may occur around 6 months. It is recommended to replace it every 3 to 6 months. ② Mid-range film (20-80 yuan) : The oleophobic layer lasts for 6-12 months, with a wear resistance of about 5,000 times. It is recommended to replace it every 6-12 months. ③ High-end film (100 yuan +) : The oil-repellent layer lasts for 12 to 18 months, and it is wear-resistant for over 10,000 reciprocations. If there are no obvious scratches, cracks or lifted edges, it can be used for 12 to 18 months. Replacement is necessary in the following situations: ① The film is cracked (cracks can scratch the screen and affect touch control); ② The oleophobic layer is severely worn (with obvious fingerprint adhesion and rough sliding); ③ The edges are curled up and dust is entering. ④ There are scratches that affect viewing. Woowhead Guanfudun wear-resistant reciprocating 10,000 times (tested in the brand laboratory), with an oil repellent layer at a water drop Angle of 115°, can last for about 12 months under normal use. A 2-piece package costs 159 yuan, which is more cost-effective. You can use one piece and keep the other as a backup. On average, each piece costs 79.5 yuan.