The web link below explains the dosage for different ailments depending on your age.
For pain they advise 200-400mg every 4-6 hours as needed. There is no evidence that a higher dosage will provide more relief. So, yes, you are overdoing it.
They also advise that you should take the smallest dose that gives you relief.
Taking that amount of Ibuprofen can damage your stomach and cause stomach bleeding, it can damage your liver and your kidneys. I know of people who have died from taking the prescribed dose.
You should always take Ibuprofen after food to protect your stomach. A doctor may prescribe a stomach remedy to protect your stomach, but you must not take this at the same time as the Ibuprofen.
Don't drink any alcohol when taking Ibuprofen and do not lie down for 10 minutes after taking the medication.
If you teeth are bad, the dentist can sort our decaying teeth.
What gets inflamed is the gums and not your teeth. To get your gums to strengthen and help to combat gum disease, floss in between your teeth twice a day. Your dentist's hygienist will be able to show you the correct way to do this. There are different thickness of floss and also little tiny brushes that you can poke in between the teeth to clean them
Use a fluoride toothpaste and one this is suitable for sensitive teeth. Brush your teeth in the morning and again before going to bed at night. Don't brush your teeth after drinking juice, this softens the enamel and brushing after a drink can damage the soft enamel. Cut out or cut down on sugary foods and drinks and fizzy pops and drink more water. 2 litres a day is usually recommend, but more if you sweat a lot.
Drinking milk and eating dairy and yogurt is good for strong teeth and bones. Vitamin D is needed to help absorb dairy, and this is the sunshine vitamin and is also in some foods and cereals.
A lot of dentists will not treat teeth until the gums are healed.
The answer to your question is YES, you are taking too much at once of the Ibuprofen.
Jemma, nice post, and very thorough.
Great advice!! Thank you especially about the flossing. It makes a world of difference in both your gum and teeth health. Cannot be over-emphasized. mandi