There are ways to strengthen a tooth as an adult, such as practicing proper tooth care, but once it is loose, it must receive structural support, or the dentist may pull it, according to MedlinePlus. The teeth often become loose due to periodontitis, a condition that affects the bones and ligaments that support the teeth.
Ways to strengthen the teeth include using fluoride, eating the right foods and taking supplements, explains HowStuffWorks. A dentist may place fluoride on the teeth topically, and many kinds of toothpaste and mouthwashes have fluoride as part of their ingredients. People may also get fluoride through the food they eat, such as green tea and fish.
Other foods that may help strengthen the teeth include cheese, blackstrap molasses, Brazil nuts, and salmon or sardines in a can, states HowStuffWorks. Drinking red wine or cranberry juice may also help, as both contain polyphenols, which fight bacteria that cause decay. Eating meat, eggs, fish, bananas and spinach are also all important.
Taking supplements can also help make the teeth stronger, claims HowStuffWorks. Calcium, vitamin D and vitamin A are all important. People should take calcium and vitamin D together, as vitamin D helps the body absorb the calcium. Vitamin C is also helpful, as it makes the gums stronger.