Four at once

Poor guy has been teething for about 2 months now. At 6 months his bottom two came through with no problems. One day he just had teeth! Then about the beginning of April from left to right - the 3rd one came first (after about 2 weeks of pain). About a week later the 4th one came, but didn't just split the gum, it broke through and cut bits of his gums off. :( The the 2nd one came about 1 1/2 weeks later. Then finally the 1st one came same as the 4th. Misery!!!