What is to be done?As long as you press chewed gum on the surface of the seal flatly, it can clear dirt thoroughly and keep seal clean.

这时只要将嚼过的口香糖，平整压贴粘于章面上，就能彻底粘起赃污，维持图章面的清洁。

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The American Dental Association says on its Web site that "chewing sugarless gum for 20 minutes following meals can help prevent tooth decay" and recommends looking for gum with its ADA-approved seal.

CNN: Chew on this: Gum may be good for body, mind