How do you keep your sugar down when you have a sweet tooth?

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This is a real problem for me. I love carbs. But if I eat them my sugar shoots up. I've been staying away from white sugar bc my sugar was going over 300 and 400. Sugar free treats cost so much money. I have been fighting this for about 2 years. If I don't stay right on top of it and get lazy about checking it then it is out of hand again. Do you have a sweet tooth? How do you calm it down?