The answer is that the importation into Singapore of any chewing gum is prohibited under the Regulation of Imports and Exports (Chewing Gum) Regulations except for those of therapeutic value. This means no allowance for personal consumption !!!
The chewing gum ban in Singapore was enacted since 1992. This law was created because people disposed of gum incorrectly by sticking it on chairs, in mailboxes, inside keyholes and even on elevator buttons in high-rise public housing flats. The serious one was a sticking chewing gum on the door sensors of MRT trains to prevent the door from functioning properly and causing disruption of train services. -- Can you believe that incorrect disposal of gum led to this law banning gum by the Government !!!
This picture was taken from one Phamacy Shop where there is a clear plastic box selling chewing gum with the signage warning -- under the regulation set by NSA, sales of chewing gum is prohibited in the absence of the phamacist. Your coorporation is greatly appreciated.
I asked the phamacist myself, she said that it definitely needs a kind of approval / prescription from phamacist. In addition, customer needs to give information the phamacist their name & address detail as reference. Then, you can chew your chewing gum happily ever after ...