Very close together

a tooth which will be replaced as a child ages, as opposed to an adult permanent tooth; a milk tooth

A figure of modern myth said to give children a small amount of money (or sometimes a present) in exchange for a milk tooth when it falls out of a child's mouth.

One of the four teeth which come in a horse's mouth at the age of four years and a half, one on each side of the upper and of the lower jaw, between the middle teeth and the tushes.

Any tooth of the first set of teeth of young people (or livestock).

(idiomatic) Old; aged.

Alternative spelling of milk tooth

Any of various molluscs, of the class Scaphopoda, that have curved, tapering shells and a spade-like foot

(figuratively) Viciously; with all one's strength or power; without holding back.

Shaped like a saw tooth. / (mathematics, engineering) Describing a function or waveform that consists of repeated triangular transitions when graphed.