My son is not in the habit of brushing his teeth i think he has gingivitis when he brushed today since he bled from his gums. is gingivitis curable?

Yes: Frequent brushing of the teeth is a must. Need to brush twice a day for at least 2 minutes at a time. Flossing is also important. Consider peroxide rinse also. Would not be in this position most likely if you brushed your teeth daily.

Absolutely: You did not say how old your son is, but good hygiene habits definitely start from a young age. He is probably due for a professional exam and cleaning, especially if he has been remiss in his responsibilities. He may have calculus on his teeth which needs to be scraped off and he may have cavities. Make an appointment for him.

Professional visit#1: Brushing your teeth at least twice a day for at least 2 minutes, flossing once daily and rinsing twice daily with an antiseptic mouth wash are all good, but what's missing is the need to start out with a thorough exam to access the exact condition of one's oral health and than a professional cleaning or possible initial periodontal therapy. Than the better oral hygiene habits will create health!