Green’s Dictionary of Slang

1. apples, pears or any other fruit [i.e. things that may be crunched].

c.1566		Harman Caveat for Common Cursetours in Viles & Furnivall (1907) 84: crassinge chetes apels peares ar [sic] anye other frute.
1592		Groundworke of Conny-catching [as cit. c.1566].
1610		Rowlands Martin Mark-all 37: Crashing cheates: Apples.

2. the teeth.

c.1566		Harman Caveat for Common Cursetours in Viles & Furnivall (1907) 82: Crashing chetes, teeth.
1592		Groundworke of Conny-catching [as cit. c.1566].
1608		Dekker Belman’s Second Nights Walk B1: A Pratling cheate is a tongue, Crashing cheates, are teeth; Hearing cheates are Eares.
1665		Head Eng. Rogue I 48: Crashing cheats, Teeth.
1674		Head Canting Academy (2nd edn).
1688		R. Holme Academy of Armory Ch. iii item 68c: Canting Terms used by Beggars, Vagabonds, Cheaters, Cripples and Bedlams. [...] Crashing cheat, Teeth.
c.1698		B.E. Dict. Canting Crew.
1725		New Canting Dict.
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict.
1754		Scoundrel’s Dict. 19: Teeth – Crushing-chats [sic].
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.