grammar - Is it acceptable to use "them" with two objects?

Is this allowable? It is fairly clear what is meant, and yet one cannot know for sure which object is being referred to each time "them" is used.

e.g.

Sweets are bad for your teeth. If you eat them, it could damage
them.

or even the other way around....

Sweets are bad for your teeth. You could damage them if you eat
them.

Answer

Allowable? Sure. Recommended? No.

When writing, sometimes an awkward sentence reveals that a revision is in order.

In this case, you could try to clarify them thems:

Sweets are bad for your teeth. You could damage your teeth if you eat
sweets.

but then the second sentence sounds rather repetitious. Best to just get directly to your point:

Sweets can damage your teeth.