Stinging nettle

has been used medicinally & as a food since antiquity. It is rich in Calcium, Iron and many other nutrients. [See, for example, this paper or this article for more about the extraordinary properties of this wonderful plant.]
To get the maximum benefit from nettles as a tea, yoiu need to know the best way to make it.

Minerals for Remineralisation

When advising clients about remineralisation for teeth with cell salts, I generally recommend a good source of minerals in the diet as well.
Bone broths are ideal.

Nettle tea (strictly speaking it's not a tea, it an infusion) is a close second best especially for vegetarians (and it is easier to make).

Powdered egg shell (organic, well washed and dried) contains a good ratio of the minerals needed for teeth. 1/2 teaspoon a day (sprinkle on food or add to smoothies) is another very good option.

All of these things are also great for strong healthy bones and you can mix it up - use all three at different times to have some variety in life.

Although there are no strict rules when it comes to making herbal infusions, some ways of infusing nettle give better results than others. Putting a tea bag in a cup of hot water for a few minutes just doesn't allow time for the nutrients to infuse or provide enough nutrients.

Here's how it can be done for better results:

Nettle Tea

Put 28g / 1 oz (large handful) of dried nettle in 1 litre  / 35oz of boiled and slightly cooled water.

[Optional] Add pinch dried peppermint leaves or ginger or other herbs or pinch of salt for flavour.

Cover. Let infuse for 4 to 8 hours.

Strain.

Can be gently reheated (not boiled and not in microwave oven) before drinking or enjoyed cold.

Store in fridge for up to 36 hours

Think outside the square

Nettle tea is versatile- it's more than a drink.
Concentrated nettle tea can be used as a soup base or as a component in drinks or green cocktails.  EXPLORE!

Oatstraw Tea

Another nutrient-dense drink is Oatstraw tea. Again, strictly speaking this is not a tea but a decoction.

Oatstraw is especially rich in Silica (good for hair, nails, bones and teeth) and Calcium (good for bones and teeth). It also has significant amounts of Iron, Manganese, Vitamin E, B vitamins and flavanoids.

Put 28g (large handful) of dried oat straw in 1 litre of water, cover and simmer for 20 minutes.
Strain and enjoy hot or chilled (do not reheat in microwave oven). 
Store for up to two days in fridge.

Start slow

When adding any new food to your diet, start slow.
Once you are ok with it, ENJOY!