noun
sweet tooth; person who prefers sweets over alcohol
Often contrasted with 辛党 (からとう), a person who prefers alcohol or spicy/salty foods. The word can refer to a general preference for sweets or specifically to someone who chooses sweets instead of alcohol.
See also: 辛党
私は甘党で、ケーキが大好きです。
I have a sweet tooth and love cake.
彼は酒を飲まずにスイーツを頼む、完全な甘党
He doesn't drink alcohol and orders sweets instead—a total sweet-lover.