Crest 3D Whitestrips Professional Effects - 40 Strips and 20 Treatments

Crest 3D Whitestrips Professional Effects, 40 strips, is an at-home teeth-whitening kit arranged as a 20-day course. The box contains one upper and one lower strip for each treatment, while the flexible strips carry peroxide whitening gel that conforms to the teeth.

What Comes in the Kit

The US package contains 40 whitestrips for 20 treatments. That format divides the contents into 20 upper strips and 20 lower strips, rather than presenting 40 separate full-mouth applications.

Crest lists a daily wear time of 45 minutes for 20 days. The product description also identifies the strips as enamel-safe and uses the same general peroxide-based whitening approach found across Crest's Whitestrips range.

Whitening Format and Claims

The Professional Effects package carries a claim of 18 levels whiter in 20 days. That figure describes the advertised result for the complete course, not a specification such as strip length or gel volume.

The strips use a thin, flexible film with peroxide gel on the tooth-facing side. Crest describes its high-performance polymer technology as helping the strips adhere to the teeth and remove cleanly after the application period.

Professional Effects sits above single-use whitening treatments because its package is organized around 20 consecutive applications. Compared with a 40-strip Professional White kit, both formats provide 20 upper-and-lower treatments, while Professional Effects carries the separate 18-level whitening claim in its US product description.

Price and Category Position

A US dental retailer lists the 40-strip Professional Effects kit at $49.75 as of 09/18/2026. The same listing identifies a 10% hydrogen peroxide formula and 20 treatments with upper and lower strips.

That price places the kit in the professional-positioned segment of at-home whitening strips. The useful distinction is the complete 20-treatment format, the 45-minute daily application, and the stated 18-level result rather than an accessory or light-based system.

Who the Format Fits

The kit is designed for adults seeking cosmetic whitening of natural teeth at home. Its measured format suits users who want a defined 20-day course with one upper and one lower strip per application.

The product is not a replacement for dental treatment. Existing restorations, crowns, veneers, fillings, and other non-natural tooth surfaces do not whiten in the same way as natural enamel, and Crest's product information directs users to follow the package instructions.

For at-home whitening, Crest 3D Whitestrips Professional Effects is best understood as a peroxide strip system with 40 total strips, 20 complete treatments, and a 45-minute daily schedule. Its limits are the fixed course length and the fact that the advertised whitening level applies to the product's stated regimen rather than every individual result.