I have been informed by my dentist that I have loose teeth due to bone thinning. Couldnt it just be from menopause?

Related to menopause. Many women experience bone thinning after menopause because of lack of estrogen. Ask your doctor whether you should have a bone mineral density scan to check for thinning of your bones (osteoporosis). There are medications that will help slow bone loss. And don't forget calcium and vitamin d. Weight-bearing exercise may also help prevent bone loss.
Gum disease. Most often loose teeth are the result of gum or periodontal disease where the bone supporting the teeth has shrunken down. Osteoporosis from menopause is usually not the cause.