HELP: Her mouth smells like a rotten egg! How do I tell her ?

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A Reader just sent this to us for help.

I have now been with my GF for 3 months now..she is really cute and loaded but i've 1 major problem with her, she's bad mouth odour(halitosis)..sometimes whenever we cuddle and she talks to me, I have to be holding my breath at intervals and seriously,i can't get it done anymore. i'm i would hurt her easily tell her that her mouth stinks.

pls will there be any other way I could tell her without necessarily telling her straight.trust me i've tried the method of giving her gifts of mouthwash and mint sweets… You Advice plz