The Pact itself is powered by the special Cure Decor pieces. To transform, the girls open the Smile Pact and set their ribbon-shaped Cure Decor inside. They then call out "Pretty Cure! Smile Charge!", then use a powder puff to spread magic onto their bodies, allowing them to change into their Cure Forms.
The Smile Pact also grants power to the Cures. It gathers fighting spirit from the Cures and changes that into energy to perform their finishing moves. Happy gets her power by squeezing her hands to fists, and screaming to the sky, Sunny by taking masculing stance, Peace by squeezing one of her hands to fist and holding Smile Pact in her other hand right in front of her, March by squeezing Smile Pact with her both hands on her pelvis, and Beauty by squeezing Smile Pact on her chest.
In addition, other Cure Decor pieces can also be inserted into the Smile Pact to grant the Cures additional abilities and items. Many of them create something little to Candy, like costumes and haircare accessories. Also placing special Cure Decor to it, it creates the Princess Candles to Pretty Cures, and later performing group attacks Rainbow Burst, and afterwards Royal Rainbow Burst.
A compact with a pink and white design. The outside is pale pink with a fuchia middle and four fuchsia pieces attached to it. In the center is a fuchsia and white striped bow with a golden emblem attached to the middle. A dark pink line circles the middle with a plastic bow shape that has a pearl center, acting as the button.
The inside is white with the top depicting a small mirror. The bottom has a design, along with several buttons. In the center is a gold heart-shaped button to match the emblem from the lid. Surrounding it are two, small curving pearl hearts, and a row of rainbow spheres, coming in green, blue, purple, pink, red, orange, and yellow.
- The Smile Pact is the third cosmetic transformation device in the Pretty Cure franchise, being based on powder compacts. The first one is the Milky Palette (eyeshadow palette) from Yes! Pretty Cure 5 GoGo!, followed by the Heart Perfumes (perfume bottles) from Heartcatch Pretty Cure!, Love Eyes Palette from Doki Doki! Pretty Cure and Princess Perfume from Go! Princess Pretty Cure.
- Like Heartcatch Pretty Cure! (Heart Perfumes), Smile Pact also can use the collectible things to increase powers.
- The Smile Pact is the second transformation device to have its own voice, with the first being the Pickruns from Fresh Pretty Cure!.
- This is the second item to have the word "pact" in it. It was preceded by the Rose Pact and is followed by the Sweets Pact.