It has to do with saliva. The main reason, though, is that the temperature of your mouth is hotter than the temperature of your hands, and the melting point of mnms is between those. You can test this by putting an mnm in your hand and closing it, making it heat up and melt in your hand. TY for the update on my answer Pengwer1800!!
M&M's are designed with a candy shell that prevents the chocolate inside from melting in your hand. The candy shell acts as a barrier to protect the chocolate from the heat of your hands, allowing the chocolate to only melt in your mouth where it is warmer.
The slogan "M&Ms melt in your mouth, not in your hands" was created by Forrest Mars Sr., who was inspired by soldiers eating smarties during the Spanish Civil War.
The tagline "melts in your mouth, not in your hands" was invented by the Mars Company for M&M's chocolates in 1949. It was created to highlight the candy's unique candy shell that prevented it from melting easily, unlike other chocolate candies at the time.
The "Melts in Your Mouth, Not in Your Hand" slogan for M&M's began in 1954.
The slogan "Melts in your mouth, not in your hand" was used for M&M's to emphasize their chocolate shell coating that prevented them from melting in your hand. This slogan aimed to highlight the durability of M&M's and differentiate them from other chocolate candies.
Forrest Mars Sr. and Bruce Murrie invented M&M's candy in 1941. They were inspired by soldiers' requests for chocolate that wouldn't melt in their hands.
The slogan "M&Ms melt in your mouth, not in your hands" was created by Forrest Mars Sr., who was inspired by soldiers eating smarties during the Spanish Civil War.
The tagline "melts in your mouth, not in your hands" was invented by the Mars Company for M&M's chocolates in 1949. It was created to highlight the candy's unique candy shell that prevented it from melting easily, unlike other chocolate candies at the time.
The "Melts in Your Mouth, Not in Your Hand" slogan for M&M's began in 1954.
M and M's can melt in both your hand and mouth. If the temperature is warm enough the candies can melt anywhere!
M&M candies were developed during world war two because the chocolate carried by soldiers always melted in their packs. So MARS candy company developed M&M's for soldiers to carry that would melt in your mouth and not in your pack. The war was over before they were ready so they marketed them as melt in your mouth and not in your hand.
It melt in your mouth faster than your hand but the fact is it doesn't melt in you hand faster and is because of the outter cell of the m&m candy that cover it all over.
The slogan "Melts in your mouth, not in your hand" was used for M&M's to emphasize their chocolate shell coating that prevented them from melting in your hand. This slogan aimed to highlight the durability of M&M's and differentiate them from other chocolate candies.
Forrest Mars Sr. and Bruce Murrie invented M&M's candy in 1941. They were inspired by soldiers' requests for chocolate that wouldn't melt in their hands.
melt in your mouth not in your hand.
m&m's
Interestingly in the UK that slogan ("Melts in the mouth not the hand") was applied to milk chocolate Minstrels - they were a large globule of chocolate covered in a sugary coating that had a melting point higher than 36oC (normal body temperature) and so didn't melt, whereas chocolate as a melting point a little under 36oC and so does melt, in the hand. I presume the m and m slogan is for a similar reason.
M&M's can melt when exposed to high temperatures, such as leaving them in direct sunlight or near a heat source. The chocolate coating on the outside will soften and melt before the inside melts.